Originally Posted by diddy535

Well said.

With sprint booster it amplifies the signal like stated. And what that means is that when you put your foot down 20% is outputting some higher number, lets just say 35%. That said, you'll get to a certain point where there's no difference between the position you're in, say 80% and the floor. Having the sprint booster is just like putting your foot down harder. Just try the tune first before you spend another $200 or whatever a sprint booster runs. I personally don't know anyone running a tune AND a sprint booster, but if there is someone please chime in.