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Hey i just recently purchased an 06 Grand Prix GXP. It has an LS4 so i figured that this would be a good site for references. And is there a certain section for the LS4 or where would I look.
Yes, look at the vehicle-specific group of forums on this site. Front-Drive LSX vehicles section. The good thing is that you can learn tons in the Gen III and Gen IV internal engine forums too, since we all share the same basic engine platform.