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This was briefly used with my 04 Mitsubishi Evo MR. Purchased from Johnston Research and Performance for almost $400.
Video is NOT mine, but is from the jrp site. :-)
The Sprint Booster is an aftermarket electronic module that plugs in between the accelerator pedal and the engine control unit (ECU) in vehicles equipped with an electronic throttle control. Many Mercedes, BMWs, Audis, and other vehicles sold today employ electronic throttle control, and more vehicles are going that way. The Sprint Booster web site makes these claims regarding electronic throttle control and the Sprint Booster:
“The ECT system (Electronic Throttle Control) – also known as drive-by- wire – has the unfortunate downside of delayed throttle response and subdued acceleration, creating problems in certain circumstances such as up-hill starts, quick gearchanges, overtaking, etc.”
“The Sprint Booster aims to overcome this throttle response delay for ECT-equipped vehicles, providing crisp on-tap acceleration at the driver’s disposal.”
"By installing the SPRINT BOOSTER, we eliminate the delay that occurs from the moment that the throttle is depressed and the electronic throttle control opens the butterfly, thus greatly improving the car's acceleration figures."