Kit includes a lightened flywheel and the twin disk plate setup. This clutch is rated to hold 650RWHP. Why is the OS Giken movement alteration kit required? The Supra clutch in its factory configuration is a pull-type, the OS Giken uses a push-type mechanism to release the clutch assembly. PLEASE NOTE: This clutch kit is for the Billet Aluminum light weight flywheel AND Billet Aluminum Cover plate. Many of our competitors offer the inferior pressed steel covers and steel flywheel options for this application for a much cheaper price, we STRONGLY do not recomend them options for the Toyota Supra and they are still relatively expensive kits.