In layman’s terms, a catback exhaust system provides a smoother, more streamlined path for exhaust gases to exit your car, allowing your engine to work more efficiently. When catalytic converters were first introduced, most vehicles used carburetors that provided a relatively rich air-fuel ratio. Oxygen (O2) levels in the exhaust stream were therefore generally insufficient for the catalytic reaction to occur efficiently.
We want to make sure the part fits your specific vehicle so we need a little more information from you. You can find out by inspecting the emissions sticker that is located in your engine compartment.
Video Features Options Short video of our 3" Catback Exhaust for the 07+ Honda Civic Si Sedan. Note that this was installed on a naturally aspirated setup (stock header and... Already own an