I used this stuff on mine ... I put it in with half a tank of gas and ran the shit out of it. I pulled the intake off 2 and a half tanks later and the intake runners were SPOTLESS. It looked like you could eat off of them they were so clean.

I think I'm gonna try the run it straight idea for the GrandAm and see how it runs ... I may try it with myt fiance's Mustang too.