so i dont need to adjust the fuel or what about turning off the o2 sensors. i have not cats do i just need to put them back on. I took my car to a tune/muffler place do you think they will be able to find the problem or could it just be a tune.

I just recently got headers with dual 3 inch exhaust borla with no cats. The spark plugs were changed out using oridiums and the 02 sensors were extended. I have a 2000 trans am ws6 auto. The problems that occured after installation is the 2 02 sensors rear made 2 separate codes and also a p0300 ...