Thread: 5* of knock retard at WOT please help

buy the entire kit from gm.

Alright one other thing how would i be able to tell if the metal tube by the egr was leaking like blue said. I wasnt there when the guy installed my headers but he said he pretty much just set the back headers in the engine bay and then put the new engine in. Didnt say he had any problems or anything but that doesnt mean he didnt