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