@explicit spade, I agree with you completely. I just wanted to know if the OP has actually been to the track or the dyno to show some actual gains and not just perceived. I remember when I swapped pcm's to a zzp 1.0 tune and it totally changed the way the car drove, so I would suggest that the transmisison tune is what made the OP think the car was a lot faster.
and X3 on the 3.6. just buy a new hub with pulley from zzp or intense.