Just a little 2.3L Whipple with 15% overdrive and 2.75 upper pulley. Runs 20lbs boost but I know I am overspinning it quite a bit. On the dyno it has a nice curve up to 875rwhp@6500rpm. Once I hit 6500rpm ish the hp drops down to 850 and stays there for the rest of the run up to 8000rpm. Torque takes a nose dive at the 6500rpm area also. Have been told its the blower running out but the boost doesn't drop.