I currently have a k&n CAI, and slp catback exhaust. Would a PCm be worth it? Can you tell the differance? I was also thinking about getting a larger throttle body. let me know what you think.

thanks

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K&N CAI, SLP Exhaust, GMPP front and rear STB. GMPP Rear tailing arms, GMPP rear sway bars 180 Thermostat, MSD Blaster Ignition Coils, NGK Iridium TR55IX spark plugs, MSD Wires.

You should really looking into getting a powerlog and 2.5" downpipe from zzp. It eliminates the bottle necks in are exhaust, that being the front manifold and the stock downpipe with the ubend.

http://www.zzperformance.com/grand_prix ... &catid=110

http://www.zzperformance.com/grand_prix ... &catid=110

Instead of getting a pcm, find someone locally to tune your car.

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A PCM is nice for some small mods. Will from Overkill motorsports can tune to your mods. He is a supporting vendor here and could help you out. You can get a custom tune if there is someone near you to do it.

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1999 GT|SLP CAI|Borla Catback| Shift kit|18" Koblenz|GMPP Lowering|GMPP handling|Blk Headlights|ER Rcokers|HV3|HV TB http://www.fquick.com/The_Guz

The PCM made a big difference in my car. I think it is probably my best mod.

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K&N CAI/Flips Custom Headlights, Tail Lights, Reverse Light,Brake Light/Front STB/Magnaflow Exhaust

2008 Grand Prix GXP