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