Ok can I get the cliff notes version of this thread for my 04gtp. I'm putting headers on and removing the cat. I'm purchasing hptuners to do all my tuning needs but I'm concerned about the cat diagnostic test. Has hptuner come up with the ability to disable it or is it not a big deal if I leave the downstream o2 in?? Sorry for the newbie question but I don't wanna spend all the money only to have the car run like sh*t


Sent from my DROIDX using Tapatalk