Mass_Media

Ok, so i just installed headers about two weeks ago, i have a straight pipe instead of a cat and my rear 02 sensors are still hanging (haven't got a CEL so they said that they don't want to mess with the car) My question is, not having those rear 02's in is that affecting my performance? the reason i ask is last night i was out with my buddies one has a GLI the other has a GTI 1.8t, we raced and i lost, they pulled on me in every gear, when i had my y-pipe with the exhaust leak i beat these guys, now i can't so whats up? Any help would be greatly appericated I got home pissed and wanting to sell my car.

Another question: is not having those 02's in detuning my car?

Derrick2k2SE

iTrader: (3)

Have you dyno tuned yet? It's probably running super rich in the higher RPMs. I wouldn't be upset till you did that.

It's not the secondary sensors. All they do is tell the ECU whether or not to throw a code. They aren't used for tuning at all.

You'll get your code soon. It took mine almost 2 weeks and a few hundred miles. Others have had the same thing happen.

Mass_Media

No dyno yet, im getting one in the next couple weeks

frankd121

iTrader: (1)

rear o2 doesn't affect performance, just tells the car when to throw a cel

upstatemax

iTrader: (15)

I would see what your AFR is first, I would think it is just a tuning issue.

sloppymax

iTrader: (8)

every car is different but i was running 11:1 a/f after 5k rpms with my headers as opposed to almost 13:1 flat with the old cattman y pipe.