{"id":128389,"date":"2025-02-03T22:29:19","date_gmt":"2025-02-04T06:29:19","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=128389"},"modified":"2025-03-20T10:27:47","modified_gmt":"2025-03-20T17:27:47","slug":"active-exhaust-systems-what-they-are-how-they-work-and-other-faq","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/active-exhaust-systems-what-they-are-how-they-work-and-other-faq\/","title":{"rendered":"Active Exhaust Systems: What They Are, How They Work, and Other FAQ"},"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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column128389_6ae21f-73 > .kt-inside-inner-col,.kadence-column128389_6ae21f-73 > .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-column128389_6ae21f-73 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column128389_6ae21f-73 > .kt-inside-inner-col{flex-direction:column;}.kadence-column128389_6ae21f-73 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column128389_6ae21f-73 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column128389_6ae21f-73{position:relative;}@media all and (max-width: 1024px){.kadence-column128389_6ae21f-73 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column128389_6ae21f-73 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column128389_6ae21f-73 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-be0f34  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-27d582\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading128389_988880-e3, .wp-block-kadence-advancedheading.kt-adv-heading128389_988880-e3[data-kb-block=\"kb-adv-heading128389_988880-e3\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading128389_988880-e3 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading128389_988880-e3[data-kb-block=\"kb-adv-heading128389_988880-e3\"] 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-heading128389_988880-e3 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading128389_988880-e3[data-kb-block=\"kb-adv-heading128389_988880-e3\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading128389_988880-e3 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading128389_988880-e3\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>An active valve exhaust system has electronic flapper valves that allow the driver to adjust the loudness of their exhaust system according to their preference.<\/li>\n\n\n\n<li>Unlike traditional exhaust systems, an active exhaust system lets you change the vehicle&rsquo;s noise levels by adjusting the valves. The exhaust system valves are electronically controlled by actuators that you can activate using a button in the cabin.<\/li>\n\n\n\n<li>Standard exhaust systems and active exhaust systems differ in design, functionality, driving experience, performance, and fuel efficiency.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p class=\"wp-block-paragraph\">Most standard <a href=\"https:\/\/www.carparts.com\/exhaust-system\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"exhaust systems\">exhaust systems<\/a> steer exhaust flow away from the engine and cabin, keeping you and your passengers safe from any harmful fumes. They&rsquo;re also specifically designed to reduce emissions and engine noise to meet environmental regulations. However, there&rsquo;s a type of exhaust system that allows you to adjust the engine noise to your liking, so you can make it louder than usual. This is called the active exhaust system.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Is an Active Exhaust?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An active valve exhaust system has electronic flapper valves that allow the driver to adjust the loudness of their exhaust system according to their preference. When the valves open and close, they control how many unmuffled exhaust notes pass through the exhaust and create noise.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Active exhaust valves are used in vehicles like the Ford Mustang, Chevrolet Corvette, Audi RS models, and Ferrari.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Some vehicles have dual-mode exhaust systems, while others feature several modes. For example, several Ford Mustang models come with Quiet, Normal, Sport, and Track modes. The Quiet setting is typically used when driving through residential areas, so you don&rsquo;t disturb your neighbors. The louder modes are best used when you&rsquo;re driving on highways and open roads.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Does an Active Exhaust System Work?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike traditional exhaust systems, an active exhaust system lets you change the vehicle&rsquo;s noise levels by adjusting the valves. The exhaust system valves are electronically controlled by actuators that you can activate using a button in the cabin.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When set to an aggressive driving mode, the exhaust system opens all the valves, causing the engine and exhaust to sound louder. Open valves help reduce any built-up pressure from various exhaust system components, which also improves engine performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On the other hand, closed valves result in less noise. You won&rsquo;t get as much of a performance boost with quiet modes, but you do get improved fuel efficiency simply because you&rsquo;re not driving as aggressively as you naturally will in performance mode.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quiet mode increases back pressure due to the more restrictive exhaust path, which is primarily designed to reduce noise. In most driving scenarios, this added back pressure can slightly affect engine efficiency by making the engine work a bit harder to push out exhaust gases.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Performance modes open up the exhaust valves to reduce back pressure, enhancing engine performance and responsiveness.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While this setup maximizes power output, it can sometimes lead to a slight decrease in fuel efficiency because the engine is working at higher power levels more frequently.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Performance modes open up the exhaust valves to reduce back pressure caused by Quiet mode, enhancing engine performance and responsiveness.<\/p>\n<cite><em>&ndash;&nbsp;<\/em><a href=\"https:\/\/www.carparts.com\/blog\/author\/richardmccuistian\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Richard McCuistian, ASE Certified Master Automobile Technician\">Richard McCuistian, ASE Certified Master Automobile Technician<\/a><\/cite><\/blockquote>\n\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Standard Exhaust System vs. Active Exhaust System<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Here are some of the differences between standard and active exhaust systems:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Design and Functionality<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Active exhaust systems are specifically designed to let you adjust the flow of exhaust gases by controlling the valves with the press of a button. On the other hand, a standard exhaust system comes with fixed components. While you can&rsquo;t adjust its valves, it still provides a steady and consistent exhaust flow that meets emission laws.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Driving Experience<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">An active exhaust system provides a dynamic driving experience, thanks to the different sound profiles you can choose from. In contrast, a standard exhaust system promises a consistent drive with the same exhaust notes and sound levels each time.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Performance and Efficiency<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">By adjusting the valves in an active exhaust system, you&rsquo;re also able to adjust exhaust flow. This directly affects engine performance and fuel efficiency, making it easier for you to adapt to different driving conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Meanwhile, standard exhaust systems offer fixed engine performance and fuel efficiency. Unless you upgrade other parts of your vehicle, you&rsquo;re stuck with the same performance regardless of driving conditions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Is the Purpose of an Exhaust Emission System?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Regardless of its type, exhaust systems play a key role in reducing the toxic emissions of a vehicle. Internal combustion engines (ICE) burn through fuel and produce exhaust gases that can harm the environment. Exhaust systems allow vehicles to meet state laws regarding emission levels without sacrificing engine performance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Is Active Exhaust Legal?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Laws can vary depending on where you live, but some states allow exhaust modifications such as active exhaust systems as long as they meet specific conditions. For example, in California, most exhaust modifications are legal if the noise emitted falls under 95 decibels. Of course, this is under the assumption that any upgrades don&rsquo;t break other <a href=\"https:\/\/www.carparts.com\/blog\/how-long-does-a-smog-check-take\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"smog laws\">smog laws<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Keep in mind that laws can vary between states, so it&rsquo;s best to double-check your own state laws before making any modifications to your vehicle&rsquo;s current exhaust system.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Do You Know If You Have an Active Exhaust?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Not all vehicles come with an active exhaust. Active exhaust systems are typically offered as an upgrade for specific models, such as the Ford Mustang. If you aren&rsquo;t sure if your vehicle comes with an active exhaust, there are a few ways you can check.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One of the easiest ways to do so is to access the options menu on your infotainment system and look for the &ldquo;Exhaust Mode&rdquo; setting, which your car should have if it has an active exhaust. You can also inspect the tip of your mufflers for the butterfly valve, or you can check the actuator motor on the <a href=\"https:\/\/www.carparts.com\/exhaust-tip\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"exhaust tip\">exhaust tip<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Some vehicles will also have a window sticker indicating that they&rsquo;re equipped with an active exhaust system.<\/p>\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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Most standard exhaust systems steer exhaust flow away from the engine and cabin, keeping you and your passengers safe from&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/active-exhaust-systems-what-they-are-how-they-work-and-other-faq\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":130523,"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":[1237],"ppma_author":[2607,2985],"class_list":["post-128389","post","type-post","status-publish","format-standard","has-post-thumbnail","category-diy","category-exhaust-system","tag-exhaust-system-2","entry"],"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Active Exhaust Systems: What They Are, How They Work, and Other FAQ - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"What is an active exhaust system, and how does it differ from a standard exhaust system? 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Richard has worked for nearly 50 years in the automotive field as a professional technician, an instructor, a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others (published every year since May 2000). He has developed training courses and written or edited training material for companies in the U.S. Canada, and the Netherlands, and even Bulgaria. He maintained an \u201cask a mechanic\u201d website for 10 years answering questions emailed to him from all over the world.\r\n\r\nRichard has an instructional automotive YouTube channel \u201cMcCuistian\u201d with 13,500 subscribers and over 1,300 videos. Much of his professional work requires photography and videography in shop environments, but Richard also enjoys taking pictures of landscapes, skyscapes, old barns and houses, small towns. He has produced a coffee table book of digital watercolors called \u201cMemories of South Alabama\u201d created from his personal photos, along with a dozen Christian fiction short original novels and a collection of short stories, all available in Kindle or softcover format. Richard has written a 2,500-word Bible study every week for the past 20 years and uses it to teach a small group at his church every Sunday morning.\r\n\r\n<strong>Credentials:<\/strong>\r\n\r\n<ul class=\"author-list\">\r\n<li><p>ASE Certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.<\/p><\/li>\r\n<li><p>Professional Mechanic\/Technician for 25 years with experience on diesel and gasoline engines, vehicles and equipment (including hydraulics).<\/p><\/li>\r\n<li><p>Spent 5 years in fleet maintenance, 20 years in independent shops and dealerships (VW, Mazda, Renault, Jeep, Ford, Lincoln), specializing in driveability and electronics for the last 14 years of his career at the same dealership.<\/p><\/li>\r\n<li><p>Senior Contributing Editor at Motor Age Magazine, first published in Motor Age in May of 2000 and every year since. He has won two International Automotive Media Awards for technical articles published in trade magazines.<\/p><\/li>\r\n<li><p>Has attended hundreds of hours of automotive training from OEMs including GM, Volkswagen, Mazda, Renault, Jeep, Chrysler, as well as additional training at events like KC Vision and MACS (Mobile Air Climate Systems Association).<\/p><\/li>\r\n<li><p>Taught college level auto mechanics for 19 years.<\/p><\/li>\r\n<li><p>Has written for automotive training companies (including course development work for training companies in Canada and the Netherlands) and has been hired to teach professional trade show technician courses at multiple training events in Texas and Alabama.<\/p><\/li>\r\n<li><p>While still teaching at the college level, Richard launched a new automotive program in Geneva, Alabama, setting up a dual enrollment department in a new building, organizing the shop and classroom, teaching morning classes to high school students for 2 years while still teaching at the college in the afternoon.<\/p><\/li>\r\n<li><p>Richard\u2019s college program at Lurleen B. Wallace Community College worked at professional shop speed during his tenure to prepare graduates for production level work in the real world.<\/p><\/li>\r\n<\/ul>"}],"_links":{"self":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts\/128389","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/comments?post=128389"}],"version-history":[{"count":0,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts\/128389\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/media\/130523"}],"wp:attachment":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/media?parent=128389"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/categories?post=128389"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/tags?post=128389"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/ppma_author?post=128389"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}