The BMW exhaust system serves two very important functions for your vehicle and the environment. The combustion process that generates the power your vehicle needs to carry you through your daily travels creates quite a bit of pollution and noise. The BMW exhaust system processes the waste products and noise of engine combustion, helping to reduce both air and noise pollution. The BMW exhaust system is well designed and efficient, removing a great deal of the poisonous and smog producing chemicals that are contained in the exhaust gasses that are expelled by the engine during combustion. Along with the exhaust fumes, the engine releases a sound wave from combustion, which would produce an intolerably high level of noise if it were released from the vehicle unrestrained. The BMW exhaust system addresses both of these problems with a process that begins with the exhaust manifold, which collects the exhaust gasses as they are released from the engine, and directs them through the system. The next step in the BMW exhaust system is the catalytic converter, which sifts out many of the dangerous chemicals. The fumes and their accompanying sound wave then move on through the BMW exhaust system to the muffler, which uses several sound reducing methods to mute the noise of the engine before the exhaust is passed through to the tailpipe to be released into the environment. We carry a selection of quality BMW exhaust system replacement parts in our user-friendly online catalog, all at great low prices. Our Secure site makes ordering safe and easy or our toll-free phone line can take your BMW exhaust system replacement parts order just as efficiently.