Well I took my pipe of the gas truck and now the G4 runs awsome. Weird. I finally raced the G4 last night. All I have to say is wow, the thing handles damn good out of the box. I even threw on some really old 26mm Blue tires I had left over for carpet and it still handled pretty good. The only thing is that I need to get my 2 speed to engange earlier, becasue the track is pretty small.