Just installed a Cudney Racing PB80 clutch and Helix. Wow what a difference! Helix spring was really stiff and a compression spring. The rpm's run about 5000 at about 40mph. About 1000rpm higher than stock. Acceleration is phenomenal ! Just hope the extra rpm's don't cause any extra wear on engine. Anybody else have the same setup? Oh yeah my mileage dropped also.