Hi Dave, I was amazed with the on track gains that 7's only got me on the top speed end, car would hit a brick wall at 6700 in 5th with 4:88's before, now it pulls to 7400, not sure what that equates to in MPH. But I do know that 7800 in 4th is 111.06, which I bested on a lap by lap basis at my last race by 500 RPM.