I think this car has unreal power now. But I have a non important question. When I do a manual upshift from 1st to 2nd the rears will chirp. This happens at half throttle and above. It does not chirp with an auto shift from 1st to 2nd no matter where the throttle is. I was just wondering why that is or is the auto tranny set to shift more smoothly. The car has. 3.08 and a shift kit.