Amazing all-around performance gains. Achieves peak rpm faster and more aggressively. Holds peak rpm better. Superior weight profile offers better acceleration. Back shifts much quicker. Works well with stock or modified motors. Custom angle cut helix. Easily adjustable for tire size or other modifications. Comes with two washers to prevent spring bind and free up clutch movement for faster shifts. Much better power transfer than the stock weights. Includes primary and secondary springs. Spring holds much better tension on the belt than factory. Includes Goldstar weights. Stage 1 or Stage 2 kits available.