The GMC exhaust system is designed provide a smooth and efficient means for eliminating and processing the waste products produced by the engine as it runs. The engine in your vehicle uses a cyclical process of combustion to produce the power used to propel your vehicle, creating a number of chemicals as byproducts of this process, as well as a great deal of noise. The GMC exhaust system carries these waste products away from the engine and directs them through a number of exhaust components designed to remove a large portion of the dangerous chemicals they contain, and quiet the noise of the engine, reducing the levels of the air and noise pollution emitted from the tailpipe as the vehicle operates. The process begins with the collection of exhaust fumes and sound waves that carry engine noise in the GMC exhaust manifold as they are expelled from the exhaust valves. These waste products are directed away from the engine in a smooth flow to continue along the GMC exhaust system to the catalytic converter. The catalytic converter traps some chemical molecules, and burns others to reduce the amount in the exhaust gasses, before sending them on to the muffler. The muffler is in charge of reducing noise pollution, using several sound reducing techniques to quiet the sound wave produced by the engine. As the exhaust gasses leave the muffler, cleaner and quieter, they are then allowed to exit the GMC exhaust system through the tailpipe to be released into the air. Our online catalog caries a variety of quality GMC exhaust parts, all at great low prices. Our secure site makes ordering safe and easy, or placing your GMC exhaust parts order is just as convenient on our toll-free phone line, with expert customer service for your assistance.