I'm glad you said it 1st,...
I figure by now,... 2009,... People would know the '04+ GPs Don't Have A U-Bend!!!
Headers, Down-Pipe, Cooler T-Stat, Cooler Plugs, Shift Kit, Fender-Well Intake (FWI) PCM "Box Tune" or find a local tuner...
If you are going start modding, you'll need to find a scanner...
You'll want to keep an eye on what you're changing
I'd recommend the AeroForce Scan Gauge
Clicky Images For Lager Pictures
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