Very impressed with Fit, Form and function but really expected no less after all the kooks headers I have installed in the past. check it out Kooks Street Screamer Install!

Hey guys, I recently purchased a rather nice 04 GTO and was looking to modify the exhaust, I was wondering if anyone knew if a cat back, like this one (loudmouth slp31060) would throw a check engine o2 code

Trying to recoup some money, installed headers and accidentally bought a new x pipe with it, looking to unload it relatively cheap. Lmk what you'll offer for sale or trade. Thanks