I dont think that it will work with the 3.6. I have the g6 GXP 3.6L and i have been told that it will probably wont work with it.. but please try it and let me know and i will definitely order some up asap. There is headers that are specifically made for the 3.6L Milzy motorsports makes it.....butt...its 900 dollars lol
2008 G6 Gxp Street Edition
Mods:Interior LED Neon Lighting, Debadged, 20% Tint, Flowmaster 40 Series Exhaust, Res delete, Alteza black housing taillights, Spyder black housing headlights, CRAB O3 CAI, Airraid Throttle Body Spacer, Racingline Strut bar, 91 OCT WAMS Tune.
Audio:400.1 Kicker amp, 12" Kicker CVR Ported Box