When you have purchased a Lexus IS cold air intake for your vehicle, you might want to consider putting on a full Lexus IS cat back exhaust as well. Lexus IS 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 Lexus IS catalytic converter and factory Lexus IS cat back exhaust that created much back-pressure. Installing Lexus IS performance exhaust system will help to reduce back-pressure dramatically from bigger piping diameter & straighter pipe design. You can find the best Lexus IS exhaust from our online catalog. Discounted Lexus IS exhaust systems are now offered with free shipping and way below MSRP.