XClutch Stage 1 Single Sprung Organic Clutch Kit | 1999-2002 Nissan Skyline GT-R (XKNI25515-1A)1999 2002 Nissan Skyline GT R Stage 1 Single Sprung Organic Clutch Kit by XClutch XClutch Stage 1 organic upgrades have been designed for performance street applications where driveability is critical. All Stage 1 clutch kits utilize an organic friction material which offers the best driveability in the range. The discs are available in a wide variety of configurations including sprung, rigid, and steel backed depending on the specific vehicle. Stage