Pros: My MCS 07 auto trans,K&N airfilter,Alta intercooler and turbo tubes now has instantaneous response to throttle imput.Best bang for your buck.

Cons: Flashing lights in your rear view mirror.

Pros: My car is a 2004 MCS JCW with a few additional mods. The Sprintbooster has made all of the added performance feel much more available. Just a little push on the accelerator and the car responds with authority. Really adds to the fun factor!

Cons: Once your foot has pressed the accelerator pedal to 60% (or so) of available travel there is a dimishing return on the remaining 40%. In other words, you get pretty much WOT early in the accelerator pedal travel, so you can't expect much more to happen after pressing the pedal further. Not a bad thing, just need to get used to it.

Pros: Now my 06 Cooper S has a better understanding of my foot. Mine is an automatic, better communication between the foot and the ECU translates into faster response from stand still to better acceleration out of turns. Great on those big S curves going uphill. It doesn't give more hps, but it does make the hps you do have feel younger, stronger and more eager to go. ..and takes the slowdown out of paddle shifting.

Cons: Not simple to put in. In an automatic, the accelerator doesn't just slid out like he posted instructions. The top end of the accelerator box runs into the steering column so you can only move it out about 2 inches. As such, having relatively small hands or longer fingers would be a plus. A little patience and making sure you hear the click when you added the boxy end of the new cable, as an extension, on to the old and then into the accelerator box. It takes a minute or two to get use to then you wonder how you've managed without it.

Other Thoughts: Some have described this to be like a plasma booster, but I think it is much better. This gizmo brought out the inner sprinter hiding in my mini. The plasma booster does smooth out the ride a bit, but it may not play well with some of the less than excellent OEM parts in your car. With the PB, you run the risk of overheating your ignition coils and frying the ECU. This has happened to a few of us and no...it is not covered by warranty even if it because OEM parts suck sometimes.