The Pro XP is the first Polaris vehicle to have the coveted EVP Shift-Tek advanced clutching components built for it. Our adjustable “notched” weights can handle all power levels from Stage 1 all the way through X85 tunes! The notch in the weights raises the rpm to approximately 2300 rpms with the stock primary spring which is ideal for our launch control tunes. This kit also includes our EVP silver spring which will approximately raise engagement to 2600 RPMs. Additionally, our improved weight ramp angle improves acceleration and overall clutch performance.