need performance help

**kirkkarem1212** · 06-27-2010

(2002 Grand Prix GTP)

i had a cold air intake and 3.6 pulley already. now i just got done putting on headers with down pipe, cat delete, u-bend delete, 2.5" catback, borla mufflers, new plugs and wires, volt booster, and zzp pcm. the rest is all stock. the problem is even after doing all that in not feeling much of a difference.

is that normal? did i just waste all that money? am i missing something? maybe missing an upgrade that would bring everything together... any insight may be helpful

**Fivefingerdeathpunch** · 06-27-2010

You need a tune and 3.4 pulley. The tune will help the car perform better with the mods you have. I would also try to get a something that can help scan for knock just to be safe.