This is a top-off-the-line manual operated high performance clutch with technology that is not available in any other H-D orientated clutch. The TorqDrive system for Sportster allows 4 additional friction disks over stock. These additional friction plates provide 20% more clutch hold capacity; at the same time reducing lever pull by 10%. Includes a billet clutch hub and a special billet pressure plate that work together to move more oil through the clutch; this reduces drag and allows cooler operating temperatures. This Sportster TorqDrive clutch system is proven in the most demanding circumstances and offers improved clutch lever feel; smoother shifting and tunability for high horsepower engines. The expanded friction zone further increases clutch control and smooth take-offs. Will convert the stock diaphragm to 6 coil type clutch springs. As Rekluse says ''It’s not just good; it’s rEvolutionary''.