The Straightline Performance Polaris 850 Patriot Trail Performance Clutch Kit is engineered specifically for 129-inch to 146-inch track models operating from sea level to 3,000 feet elevation. Designed to work with both stock exhaust and Straightline Performance exhaust systems, this complete package includes Straightline's fully adjustable weight kit, custom-designed helix, and performance-calibrated clutch springs for improved acceleration, throttle response, backshift, and overall trail performance.