yes it did improve my 300ft times, went from running consistent 5.3 to 5.2 to consistent 5.0's, best last year was a 5.1 one time and never repeated it, this year its been 5.04, 5.04, 5.06, 5.04, 5.07. definitely pulls through the traps harder and keeps pulling. i think with some gearing changes and some tweaking i can break into the 4s for the next race, but we shall see