The difference in the throttle response with the sprint booster is unbelievable. The first time I drove my xfire with the sprint booster installed I was pulling out of my parking spot from the side of the road where I live, the speed limit is 25 mph so I accelerated very little and I shot out of my parking space like a bullet. I think anybody buying one will be impressed with the difference I have an automatic which is aggressive, I can't imagine the sprint booster for the manual which they claim is even more aggressive.