For Big tire RZR’s. Gain top speed over the stock clutching. Much better power transfer than the stock weights. Springs hold much better tension on the belt than factory. Quicker back shifting when off the throttle. More responsive feel. Less belt slip resulting in longer belt life. Longer clutch life. Kit Includes BMP magnetic adjustable weights, BMP Helix, BMP primary spring, BMP secondary spring & a setup guideline.