When you have purchased a BMW cold air intake for your vehicle, you might want to consider putting on a full BMW cat back exhaust as well. BMW Cold air intake system directs more cool air into the combustion chamber, in result, the fuel burns better with colder condensed oxygen. With all these exhaust gases exiting the motor, The exhaust flow is highly restricted by the BMW catalytic converter and factory BMW cat back exhaust that created much back-pressure. Installing BMW performance exhaust system will help to reduce back-pressure dramatically from bigger piping diameter & straighter pipe design. You can find the best BMW exhaust from our online catalog. Discounted BMW exhaust systems are now offered with free shipping and way below MSRP.