Jalbert

thanks

Phoenix 5.7

iTrader: (7)

need to know a few things first. are u keeping AIR? u would want to delete the rear O2s, or at least have O2 sims. headers make the car run rich, its driveable, but for best performance and mileage a tune is good to get. if u are planning on other mods, do those before getting a tune.

foff667

iTrader: (2)

just to add not all cars necessarily go rich...some go lean(at least top end) when doing headers...so definitly if your deleting cats its always good to retune your a/f and turn off cot as well as deleting codes and then tuning the pe for a decent wot a/f.

WS6FirebirdTA00

iTrader: (33)

i would tune it after a big mod like that, it sends a big shock to the sysem freeing up the exhaust that muhc and also the o2 readings can change