SPEC Stage 3 Plus Clutch Kits (Sprung) - Below 550hp Application SPEC Stage 3+ clutch kits are primarily intended for street use, drag racing, pulling, and autocrossing. As the flagship stage for a high-powered street or race car that requires a manageable and friendly engagement, Stage 3+ clutch kits feature carbon-graphite full-faced material that offers unparalleled life, friction co-efficient, and drivability in one package. Their hubs are double-sprung with spring cover reliefs for flexibility and heat-treated components for strength and durability.Additional features of SPEC Stage 3+ clutch kits:* High-clamp pressure plate* Carbon semi-metallic friction material* High-torque sprung hub and disc assembly* Bearing and tool kit included* Also great for road racing, rally, and drifting SPEC Stage 5 Clutch Kits (Unsprung) - Above 550hp application SPEC Stage 5 clutch kits feature full-metallic discs with the highest possible friction co-efficient. They are street-drivable but not street friendly. Their hubs are solid with 12 rivets and each assembly is heat-treated for strength and durability.Additional features of SPEC Stage 5 clutch kits:* High-clamp pressure plate* Full-metallic friction material* High-torque solid hub and disc assembly* Bearing and tool kit included* Best for extreme street use and drag racing* Also excellent for pulling and autocross For optimal performance, we highly recommend that you replacing your flywheel when installing a SPEC Performance Clutch Kit or . All SPEC Performance Clutch Kits are made to order Both SPEC Stage 3+ and SPEC Stage 5 kit are perfect for all P2 application. If you have any question please contact to consult with our specialist.