sprint booster is for the throttle response from TAKE OFF. It has never been promoted to do anything else. In traffic, from stop lights, starting line at the track, is all good for the sprint booster. You need other mods to help with your power from rolling starts as your throttle is already engauged...lol...Good luck with your mods, but, you were way off base in bad mouthing a product you didn't understand from the get-go. It happens. Complain about the price, for what you get, that I understand, but still worth it to me. Mine are almost too touchy for normal driving, but I would rather have it that way than the other.