Increased friction disk count from 8 OEM to 10 TorqDrive« Adjustable hold-down ring to customize spring setting for optimal clutch feel and clutch life management Designed to drop directly into OEM clutch components Stronger drive throughout the power band - gain power without any expensive motor mods Increased clutch life Enhanced clutch modulation and clutch feel Provides more connection to power and clutch management Virtually eliminates clutch fade Better starts and acceleration out of corners Additional friction disks provide 16% gain in torque capacity over stock. CLUTCH PK TQD YZF450F 23+