The product delivers exactly what it promises. Don't buy it expecting your car to race. I have certain mods in my SUV and was looking for this improvement when accelerating to make the throttle more responsive and I got it with SprintBooster. I tested two modes and keep it in sport mode 6 for now, never got to the highway to test race mode well. If you just want to get rid of that initial delay in opening the throttle, look no further.
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