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It is quite funny how people who did not use the thing trying to share their opinions about it on many websites. I was searching for information about Sprint Booster from the guys who actually used it on their cars. It performed well and did exactly what I expected it would. I was not expecting to get extra HPs out of it, just to optimize the use of what I have already. I was after getting rid of the lag, so the car is no longer hesitates when I step on the throttle, especially when taking off from zero speed, it just follows the command. Possibility to gradually adjust/calibrate response is also fun, but I do not use it so often and mostly drive on top of the green sector. What feels really bad is to turn this thing off as human nature is fast getting use to good things but another way around feels so-o bad. :)
Man I wish I had bought this the day I bought the car. The stick throttle mapping is so bizarre, at almost no point does 10% throttle equal 10% output. This fixes all that. Install took about 10 minutes on an E70 M, one Allen bolt removes the throttle pedal, the rest is plug and ay. In Race mode, level 9, the throttle is super sensitive and rarely requires much input. No adverse effects on steering weight like other brands. Highly recommended, the car now feels like a supercar, as it is!