I currently have a Q300 with stock headers and cat. I know people have replaced the cat with a test pipe for the Q300 but what are the gains that you can feel and what are the differences in sound I want it to sound a little meaner.
Driving my friends car with full exhaust feels a lot quicker than my stock RSX-S. Most gains for stock K20( vs intake or catback) is from race header taking out the catalytic converter.
I've heard good things about the skunk2 alpha header but also that they have fitment problems. You know any other race headers that are good?
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