ya it does sound bad. I'm going to put on new muffles maybe on Tuesday. i have the zzp computer on and the erased the P0420 trouble codes (which is the oxygen sensor codes). And i had zzp fix the leak in the y pipe with the headers. I'm not sure if that is the problem. Maybe i need a tune? because i have no back pressure and the car is supposed to run with everything. But i really don't think its a leak anymore because i made sure there was no air getting out anywhere on the down pipe and the y pipe and stuff. Or do you guys think that my o2 sensors have to go through a drive cycle and it might tune itself to run properly.
Today when i was testing it i feel like its just not peeking when i go fuel throttle. So if this helps i want to see what everyone thinks.
