I have straight pipe on my car, worst thing ive done too my car. My gas mileage went down, have a check engine light on. My front 02 is showing too much activity and dumping extra fuel in. I recommend replacingnit with a new catalytic converter..I know im switching back too one once I get the funds
my friend had a jays racing exhaust on his s2k. with the stock cat the drone was unbearable. the noise level was just terrible loud not fun loud. he got a test pipe like your buddy posted and it sounds better in quality and has no drone. nothing happened to his gas mileage and he doesnt have a cel
My secondary o2 is switching too much and the primary is trying to compensate for the secondary. I watched the pattern on the primary and instead of being a good square pattern it has constant spikes at a more rapid pace. I just replaced the primary o2 before removing the cat, primary o2 showed flat line lol.
