{"id":128385,"date":"2025-02-03T22:27:40","date_gmt":"2025-02-04T06:27:40","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=128385"},"modified":"2026-01-06T23:58:24","modified_gmt":"2026-01-07T07:58:24","slug":"a-brief-guide-to-the-exhaust-manifold","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/a-brief-guide-to-the-exhaust-manifold\/","title":{"rendered":"A Brief Guide to the Exhaust Manifold"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column128385_b0c38d-2c > .kt-inside-inner-col,.kadence-column128385_b0c38d-2c > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column128385_b0c38d-2c > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column128385_b0c38d-2c > .kt-inside-inner-col{flex-direction:column;}.kadence-column128385_b0c38d-2c > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column128385_b0c38d-2c > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column128385_b0c38d-2c{position:relative;}@media all and (max-width: 1024px){.kadence-column128385_b0c38d-2c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column128385_b0c38d-2c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column128385_b0c38d-2c inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-20f74f  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-03bc90\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading128385_a90bed-80, .wp-block-kadence-advancedheading.kt-adv-heading128385_a90bed-80[data-kb-block=\"kb-adv-heading128385_a90bed-80\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading128385_a90bed-80 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading128385_a90bed-80[data-kb-block=\"kb-adv-heading128385_a90bed-80\"] mark.kt-highlight{font-family:Inter;font-weight:500;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading128385_a90bed-80 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading128385_a90bed-80[data-kb-block=\"kb-adv-heading128385_a90bed-80\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading128385_a90bed-80 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading128385_a90bed-80\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The exhaust manifold collects the exhaust gases from the engine&rsquo;s cylinder head and sends them through the exhaust pipe.<\/li>\n\n\n\n<li>The two main types are cast iron exhaust manifolds and tubular steel exhaust manifolds.<\/li>\n\n\n\n<li>Cast iron exhaust manifolds are made of cast iron, and their advantages include low cost, durability, and long service life.<\/li>\n\n\n\n<li>Tubular steel exhaust manifolds are made of either more affordable mild steel or costlier, more capable stainless steel.<\/li>\n\n\n\n<li>The most common reasons for a cracked exhaust manifold are excessive heat cycles, age, and damaged exhaust system hangers.<\/li>\n\n\n\n<li>Cracked exhaust manifold symptoms include visible fractures, loud noises from the exhaust system, and reduced fuel efficiency.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Your vehicle&rsquo;s exhaust system has many parts that work together to remove hot gases from the engine, reduce their emissions, and expel them from the exhaust system. While each part plays a vital role in the system, the <a href=\"https:\/\/www.carparts.com\/exhaust-manifold\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"exhaust manifold\">exhaust manifold<\/a> is very important. It enables the exhaust gases to flow into the exhaust system.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Is an Exhaust Manifold?<\/h2>\n\n\n\n<p>The exhaust manifold gathers the exhaust gases from the engine&rsquo;s <a href=\"https:\/\/www.carparts.com\/cylinder-head\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"cylinder head\">cylinder head<\/a>. It&rsquo;s attached to the exhaust port on the cylinder head and directs the hot gases to the exhaust pipe. From there, the exhaust gases can proceed to the <a href=\"https:\/\/www.carparts.com\/catalytic-converter\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"catalytic converter\">catalytic converter<\/a>.<\/p>\n\n\n\n<p>Some exhaust manifolds can store the significant heat generated by the freshly combusted exhaust gases. The accumulated heat combusts a portion of the unburned fuel in the exhaust before the gas flows to the catalytic converter. Exhaust manifold products capable of this feat can help reduce the toxic emissions in the exhaust gases.<\/p>\n\n\n\n<p>Furthermore, the exhaust manifold keeps exhaust gases in the exhaust system instead of escaping into the atmosphere or entering your vehicle&rsquo;s cabin. Working together with exhaust manifold gaskets to maintain the seal, the manifold protects the occupants of the car or truck from breathing in dangerous fumes.<\/p>\n\n\n\n<div class=\"wp-block-data443-irp-shortcode irp-shortcode\"><div style=\"clear:both; margin-top:0em; margin-bottom:1em;\"><a href=\"https:\/\/www.carparts.com\/blog\/p2432-code-secondary-air-injection-system-airflow-pressure-sensor-circuit-low-bank-1\/\" target=\"_self\" rel=\"dofollow\" class=\"u59700bdb19c2fad12d619e5b773ae7b7\"><style> .u59700bdb19c2fad12d619e5b773ae7b7 { padding:0px; margin: 0; padding-top:1em!important; padding-bottom:1em!important; width:100%; display: block; font-weight:bold; background-color:#eaeaea; border:0!important; border-left:4px solid #34495E!important; text-decoration:none; } .u59700bdb19c2fad12d619e5b773ae7b7:active, .u59700bdb19c2fad12d619e5b773ae7b7:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .u59700bdb19c2fad12d619e5b773ae7b7 { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .u59700bdb19c2fad12d619e5b773ae7b7 .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .u59700bdb19c2fad12d619e5b773ae7b7 .postTitle { color:#000000; text-decoration: underline!important; font-size: 16px; } .u59700bdb19c2fad12d619e5b773ae7b7:hover .postTitle { text-decoration: underline!important; } <\/style><div style=\"padding-left:1em; padding-right:1em;\"><span class=\"ctaText\">See also<\/span>&nbsp; <span class=\"postTitle\">P2432 Code: Secondary Air Injection System Airflow \/ Pressure Sensor Circuit Low Bank 1<\/span><\/div><\/a><\/div><\/div>\n\n\n<style>.kadence-column128385_d7a80c-f1 > .kt-inside-inner-col,.kadence-column128385_d7a80c-f1 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column128385_d7a80c-f1 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column128385_d7a80c-f1 > .kt-inside-inner-col{flex-direction:column;}.kadence-column128385_d7a80c-f1 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column128385_d7a80c-f1 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column128385_d7a80c-f1{position:relative;}@media all and (max-width: 1024px){.kadence-column128385_d7a80c-f1 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column128385_d7a80c-f1 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column128385_d7a80c-f1 kb-section-dir-vertical kb-section-sm-dir-vertical inner-column-1 pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>.kb-row-layout-id128385_62be99-72 > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id128385_62be99-72 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id128385_62be99-72 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-md, 2rem);padding-top:20px;padding-right:32px;padding-bottom:20px;padding-left:16px;grid-template-columns:minmax(0, calc(10% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)))minmax(0, calc(90% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)));}.kb-row-layout-id128385_62be99-72 > .kt-row-layout-overlay{opacity:0.00;}.kb-row-layout-id128385_62be99-72 .kt-row-layout-bottom-sep{height:100px;}.kb-row-layout-id128385_62be99-72 .kt-row-layout-bottom-sep svg{width:100%;}.kb-row-layout-id128385_62be99-72 .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}.kb-row-layout-id128385_62be99-72 .kt-row-layout-top-sep{height:100px;}.kb-row-layout-id128385_62be99-72 .kt-row-layout-top-sep svg{width:100%;}.kb-row-layout-id128385_62be99-72 .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){.kb-row-layout-id128385_62be99-72 > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){.kb-row-layout-id128385_62be99-72 .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){.kb-row-layout-id128385_62be99-72 .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){.kb-row-layout-id128385_62be99-72 > .kt-row-column-wrap{padding-top:28px;padding-right:16px;padding-bottom:25px;padding-left:16px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}.kb-row-layout-id128385_62be99-72 .kt-row-layout-bottom-sep{height:px;}.kb-row-layout-id128385_62be99-72 .kt-row-layout-bottom-sep svg{width:%;}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id128385_62be99-72 alignnone pro-tip-wrap wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-right-golden kt-tab-layout-right-golden kt-mobile-layout-right-golden kt-row-valign-top\">\n<style>.kadence-column128385_1195d4-02 > .kt-inside-inner-col{display:flex;}.kadence-column128385_1195d4-02 > .kt-inside-inner-col{min-height:45px;}.kadence-column128385_1195d4-02 > .kt-inside-inner-col,.kadence-column128385_1195d4-02 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column128385_1195d4-02 > .kt-inside-inner-col{row-gap:0px;column-gap:0px;}.kadence-column128385_1195d4-02 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column128385_1195d4-02 > .kt-inside-inner-col > *, .kadence-column128385_1195d4-02 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column128385_1195d4-02 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column128385_1195d4-02 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column128385_1195d4-02 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column128385_1195d4-02{position:relative;}@media all and (max-width: 1024px){.kadence-column128385_1195d4-02 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column128385_1195d4-02 > .kt-inside-inner-col > *, .kadence-column128385_1195d4-02 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column128385_1195d4-02 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column128385_1195d4-02 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column128385_1195d4-02 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column128385_1195d4-02 > .kt-inside-inner-col > *, .kadence-column128385_1195d4-02 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column128385_1195d4-02 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column128385_1195d4-02 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column128385_1195d4-02 kb-section-dir-horizontal kb-section-md-dir-horizontal inner-column-1 pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image128385_efbbfe-e9.kb-image-is-ratio-size, .kb-image128385_efbbfe-e9 .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image128385_efbbfe-e9.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image128385_efbbfe-e9 .kb-image-is-ratio-size{align-self:unset;}.kb-image128385_efbbfe-e9 figure{max-width:45px;}.kb-image128385_efbbfe-e9 .image-is-svg, .kb-image128385_efbbfe-e9 .image-is-svg img{width:100%;}.kb-image128385_efbbfe-e9 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image128385_efbbfe-e9\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/f_auto,dpr_auto,q_auto,c_pad\/carparts\/blog\/widgets\/protip\/services-icon\" alt=\"\" class=\"kb-img\"><\/figure><\/div>\n<\/div><\/div>\n\n\n<style>.kadence-column128385_bed23e-9e > .kt-inside-inner-col,.kadence-column128385_bed23e-9e > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column128385_bed23e-9e > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column128385_bed23e-9e > .kt-inside-inner-col{flex-direction:column;}.kadence-column128385_bed23e-9e > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column128385_bed23e-9e > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column128385_bed23e-9e{position:relative;}@media all and (max-width: 1024px){.kadence-column128385_bed23e-9e > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column128385_bed23e-9e > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column128385_bed23e-9e inner-column-2 pro-tip-item2\"><div class=\"kt-inside-inner-col\">\n<div class=\"protip-desc\">\n\t<div class=\"help-tip\">\n\t\t<p><strong>Pro Tips<\/strong> are nuggets of information direct from ASE-certified automobile technicians working with CarParts.com, which may include unique, personal insights based on their years of experience working in the automotive industry. These can help you make more informed decisions about your car.<\/p>\n\t<\/div>\n    <div class=\"help-caption\">\n        <p>\n            <strong>Pro Tip:<\/strong>\n            You can usually find the exhaust manifold between the engine cylinder head and the catalytic converter except on some four-cylinder engines where the light-off converter is part of the exhaust manifold. This is actually very common on newer front-wheel-drive vehicles.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n\n\n<p>Most V-shaped engines have two exhaust manifolds. Each cylinder bank gets one manifold that handles the exhaust gases produced by that bank.<\/p>\n\n\n\n<p>Inline engines have one cylinder bank. A single exhaust manifold moves their exhaust gases into the exhaust pipe and to the catalytic converter.<\/p>\n\n\n\n<p>Similarly, the majority of rotary engines feature one exhaust manifold.<\/p>\n\n\n<style>.kadence-column128385_cfc232-e1 > .kt-inside-inner-col,.kadence-column128385_cfc232-e1 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column128385_cfc232-e1 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column128385_cfc232-e1 > .kt-inside-inner-col{flex-direction:column;}.kadence-column128385_cfc232-e1 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column128385_cfc232-e1 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column128385_cfc232-e1{position:relative;}@media all and (max-width: 1024px){.kadence-column128385_cfc232-e1 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column128385_cfc232-e1 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column128385_cfc232-e1 kb-section-dir-vertical kb-section-sm-dir-vertical inner-column-1 pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>.kb-row-layout-id128385_7f566d-d6 > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id128385_7f566d-d6 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id128385_7f566d-d6 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-md, 2rem);padding-top:20px;padding-right:32px;padding-bottom:20px;padding-left:16px;grid-template-columns:minmax(0, calc(10% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)))minmax(0, calc(90% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)));}.kb-row-layout-id128385_7f566d-d6 > .kt-row-layout-overlay{opacity:0.00;}.kb-row-layout-id128385_7f566d-d6 .kt-row-layout-bottom-sep{height:100px;}.kb-row-layout-id128385_7f566d-d6 .kt-row-layout-bottom-sep svg{width:100%;}.kb-row-layout-id128385_7f566d-d6 .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}.kb-row-layout-id128385_7f566d-d6 .kt-row-layout-top-sep{height:100px;}.kb-row-layout-id128385_7f566d-d6 .kt-row-layout-top-sep svg{width:100%;}.kb-row-layout-id128385_7f566d-d6 .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){.kb-row-layout-id128385_7f566d-d6 > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){.kb-row-layout-id128385_7f566d-d6 .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){.kb-row-layout-id128385_7f566d-d6 .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){.kb-row-layout-id128385_7f566d-d6 > .kt-row-column-wrap{padding-top:28px;padding-right:16px;padding-bottom:25px;padding-left:16px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}.kb-row-layout-id128385_7f566d-d6 .kt-row-layout-bottom-sep{height:px;}.kb-row-layout-id128385_7f566d-d6 .kt-row-layout-bottom-sep svg{width:%;}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id128385_7f566d-d6 alignnone pro-tip-wrap wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-right-golden kt-tab-layout-right-golden kt-mobile-layout-right-golden kt-row-valign-top\">\n<style>.kadence-column128385_115d30-14 > .kt-inside-inner-col{display:flex;}.kadence-column128385_115d30-14 > .kt-inside-inner-col{min-height:45px;}.kadence-column128385_115d30-14 > .kt-inside-inner-col,.kadence-column128385_115d30-14 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column128385_115d30-14 > .kt-inside-inner-col{row-gap:0px;column-gap:0px;}.kadence-column128385_115d30-14 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column128385_115d30-14 > .kt-inside-inner-col > *, .kadence-column128385_115d30-14 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column128385_115d30-14 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column128385_115d30-14 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column128385_115d30-14 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column128385_115d30-14{position:relative;}@media all and (max-width: 1024px){.kadence-column128385_115d30-14 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column128385_115d30-14 > .kt-inside-inner-col > *, .kadence-column128385_115d30-14 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column128385_115d30-14 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column128385_115d30-14 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column128385_115d30-14 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column128385_115d30-14 > .kt-inside-inner-col > *, .kadence-column128385_115d30-14 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column128385_115d30-14 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column128385_115d30-14 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column128385_115d30-14 kb-section-dir-horizontal kb-section-md-dir-horizontal inner-column-1 pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image128385_9e1768-c1.kb-image-is-ratio-size, .kb-image128385_9e1768-c1 .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image128385_9e1768-c1.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image128385_9e1768-c1 .kb-image-is-ratio-size{align-self:unset;}.kb-image128385_9e1768-c1 figure{max-width:45px;}.kb-image128385_9e1768-c1 .image-is-svg, .kb-image128385_9e1768-c1 .image-is-svg img{width:100%;}.kb-image128385_9e1768-c1 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image128385_9e1768-c1\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/f_auto,dpr_auto,q_auto,c_pad\/carparts\/blog\/widgets\/protip\/services-icon\" alt=\"\" class=\"kb-img\"><\/figure><\/div>\n<\/div><\/div>\n\n\n<style>.kadence-column128385_5f1596-e5 > .kt-inside-inner-col,.kadence-column128385_5f1596-e5 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column128385_5f1596-e5 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column128385_5f1596-e5 > .kt-inside-inner-col{flex-direction:column;}.kadence-column128385_5f1596-e5 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column128385_5f1596-e5 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column128385_5f1596-e5{position:relative;}@media all and (max-width: 1024px){.kadence-column128385_5f1596-e5 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column128385_5f1596-e5 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column128385_5f1596-e5 inner-column-2 pro-tip-item2\"><div class=\"kt-inside-inner-col\">\n<div class=\"protip-desc\">\n\t<div class=\"help-tip\">\n\t\t<p><strong>Pro Tips<\/strong> are nuggets of information direct from ASE-certified automobile technicians working with CarParts.com, which may include unique, personal insights based on their years of experience working in the automotive industry. These can help you make more informed decisions about your car.<\/p>\n\t<\/div>\n    <div class=\"help-caption\">\n        <p>\n            <strong>Pro Tip:<\/strong>\n            Older rotary engines had a &ldquo;thermal reactor,&rdquo; which was a catalyst that was part of the exhaust manifold. But rather than dealing with NOx like modern light-off converters married to the exhaust manifold, the rotary engine&rsquo;s thermal reactor was basically an oxidation catalyst that dealt only with HC and CO.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Exhaust Manifold Types<\/h2>\n\n\n\n<p>Exhaust manifolds are classified according to a mix of their materials and construction. Here are the most common types of exhaust manifolds according to their material:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Cast Iron Exhaust Manifold<\/h3>\n\n\n\n<p>Cast iron exhaust manifolds use iron and are cast into their shapes. Cast iron is inexpensive to manufacture, easy to work with, durable, and can last for a long time.<\/p>\n\n\n\n<p>Most cars and trucks have cast iron exhaust manifolds as stock parts. Modern vehicles prioritize compact size and service life over <a href=\"https:\/\/www.carparts.com\/blog\/horsepower-explained\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"horsepower\">horsepower<\/a> and torque. Thus, a cast iron exhaust manifold will usually suffice for everyday driving.<\/p>\n\n\n\n<p>Cast iron comes with drawbacks, such as being heavier than steel. It also becomes brittle and vulnerable to fracturing over time and when exposed to high heat.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Tubular Steel Exhaust Manifold<\/h3>\n\n\n\n<p>Tubular steel exhaust manifolds are made up of steel tubes welded together at their intersections. The manifold itself is welded to the cylinder head flange.<\/p>\n\n\n\n<p>Many tubular steel exhaust manifolds feature integrated flex-pipes, enabling independent flexing of the manifold&rsquo;s parts in response to temperature changes.<\/p>\n\n\n\n<p>This exhaust manifold uses either mild steel or stainless steel. Both types of steel have advantages and disadvantages.<\/p>\n\n\n\n<p>Mild steel is more affordable and doesn&rsquo;t expand much when heated. It&rsquo;s highly suited for the flanges of tubular steel exhaust manifolds. However, it doesn&rsquo;t last as long as sturdier materials.<\/p>\n\n\n\n<p>Stainless steel features superior strength and resistance to corrosion. However, it tends to expand in volume when heated and contract when it cools. Constant and severe expansion and contraction can destroy the fasteners that connect the exhaust system. Stainless steel also costs more.<\/p>\n\n\n\n<p>Tubular steel exhaust manifolds typically have better gas flow than their cast iron counterparts. They&rsquo;re usually found on performance vehicles, like sports cars and Jeep models.<\/p>\n\n\n\n<p>Tubular steel exhaust manifolds also retain more heat, enabling them to burn more fuel in the exhaust gas. They increase the engine&rsquo;s horsepower and enhance the vehicle&rsquo;s performance.<\/p>\n\n\n\n<p>A stainless steel exhaust manifold will pay for more than its cost in terms of its looks, ability to withstand corrosion, and long service life.<\/p>\n\n\n\n<p>Tubular steel exhaust manifolds must resist exposure to external elements like dust, high temperatures, and moisture that lead to rust. Stainless steel manifolds can resist these corrosive elements longer than mild steel. However, extended exposure to high temperatures can change the color of the stainless steel near the cylinder head flange.<\/p>\n\n\n\n<div class=\"rsi-card\">\n  <div class=\"rsi-thumb\">\n    <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/d_noimage.jpg\/b_white\/e_sharpen,e_auto_brightness,e_auto_contrast\/f_auto\/q_auto:eco,dpr_auto\/w_873,h_873,c_pad\/images\/rb674464_1\">\n  <\/div>\n  <div class=\"rsi-info\">\n    <span class=\"rsi-title\">The Best Exhaust Manifold Brands: Quality Replacements for Your Car<\/span>\n    <span class=\"rsi-desc\">See which exhaust manifold brands are best for your vehicle. Learn about application, configuration, and kit contents, and find budget-friendly replacement brands.<\/span>\n    <a href=\"https:\/\/www.carparts.com\/blog\/the-best-exhaust-manifold-brands-quality-replacements-for-your-car-quickref\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Discover Your Options\">Discover Your Options<\/a>\n  <\/div>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">Common Reasons For a Cracked Exhaust Manifold<\/h2>\n\n\n\n<p>The exhaust manifold can develop many issues that reduce its performance or lead to failure. However, the most common problem is a cracked exhaust manifold.<\/p>\n\n\n\n<p>Tiny cracks form in the fatigued metal. The fractures grow in size until they become holes that release exhaust gases.<\/p>\n\n\n\n<p>Here are the most likely reasons for a cracked exhaust manifold:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Excessive Heat Cycles<\/h3>\n\n\n\n<p>The heat cycle refers to a period when an object heats up and cools down. The exhaust manifold goes through numerous cycles where its temperature rises and falls. Eventually, the manifold reaches its limit and cracks.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Age<\/h3>\n\n\n\n<p>The older the exhaust manifold gets, the more likely it might fracture. Not only do the repeating heat cycles weaken it, but other factors might also degrade it.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Damaged Exhaust System Hangers<\/h3>\n\n\n\n<p><a href=\"https:\/\/www.carparts.com\/exhaust-hanger\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Exhaust system hangers\">Exhaust system hangers<\/a> support the weight of exhaust parts. They help the exhaust manifold hold up the rest of the exhaust system.<\/p>\n\n\n\n<p>Unfortunately, exhaust system hangers can break off. Without the assistance of intact hangers, the exhaust manifold is forced to bear the combined weight of the exhaust parts. The manifold itself can crack and fail if it supports too much weight for too long.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Cracked Exhaust Manifold Symptoms<\/h2>\n\n\n\n<p>Here are the most common cracked exhaust manifold symptoms:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fractures that you can see with the unaided eye.<\/li>\n\n\n\n<li>Loud noises coming from the exhaust system.<\/li>\n\n\n\n<li>Reduced fuel efficiency and engine performance.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/what-causes-that-burning-smell-from-your-car\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Burning smell from the engine\">Burning smell from the engine<\/a> bay that might enter the vehicle&rsquo;s interior.<\/li>\n<\/ul>\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Your vehicle&rsquo;s exhaust system has many parts that work together to remove hot gases from the engine, reduce their emissions,&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/a-brief-guide-to-the-exhaust-manifold\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":130519,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[52,3750],"tags":[1238],"ppma_author":[2607,2985],"class_list":{"0":"post-128385","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-exhaust-system","9":"tag-exhaust-manifold-2","10":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>A Brief Guide to the Exhaust Manifold - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"What is an exhaust manifold? This guide will cover the part, different types of exhaust manifolds, and what causes cracked manifolds.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.carparts.com\/blog\/a-brief-guide-to-the-exhaust-manifold\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A Brief Guide to the Exhaust Manifold - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"What is an exhaust manifold? This guide will cover the part, different types of exhaust manifolds, and what causes cracked manifolds.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/a-brief-guide-to-the-exhaust-manifold\/\" \/>\n<meta property=\"og:site_name\" content=\"In The Garage with CarParts.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:published_time\" content=\"2025-02-04T06:27:40+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-01-07T07:58:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2025\/01\/exhaust-manifold-guide.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"1000\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"CarParts.com Research Team, Richard McCuistian, ASE Certified Master Automobile Technician\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@https:\/\/twitter.com\/CarPartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"CarParts.com Research Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/a-brief-guide-to-the-exhaust-manifold\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/a-brief-guide-to-the-exhaust-manifold\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"1651\",\"name\":\"CarParts.com Research Team\",\"jobTitle\":\"Expert Automotive Writer\",\"description\":\"The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. 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