Check engine light, P0133?
HP tuning
or talk to your tuner if someone has tuned the car
if you run the scanner and the sensors are working fine ,, i dont know ,, but just ask someone to scan the car for u
It has to do with long tubes not allowing the sensors to heat up correctly If i understand right..
LT headers as a rule run cooler than a stock setup, where the o2s are placed close to the engine.
Ive heard where cats help this issue by building up some heat.. Im considering going back to high flow cats because I have no mufflers and its too loud and I feel like I might kill two birds with one stone.


