I find the throttle response in my Cooper S to be a bit lazy and it's been getting to me. Googling around for a solution, I found the
Sprint Booster. Seems to be exactly what I'm looking for - customizable throttle response tunes you can hit on the fly. You cannot find a bad review about this thing. People rave about it. I ordered one last night and am looking forward to installing it. Anyone used one of these?
Here's a video: