SPEC billet flywheels are manufactured and developed for specific driving environments and recommended based on how each car reacts to changes in rotating mass. Manufactured from only the highest quality steel and aluminum, they are the only flywheels on the market manufactured to a .001 machine tolerance, guaranteeing a flat seating surface for the clutch and smooth rotational qualities for perfect balance and extended engine life.
This is NOT a stock style flywheel. It is intended for use with SPEC Part Numbers SC661, SC662, SC663H, SC663, SC663F, SC664, & SC665 only. If you're looking for a stock style flywheel, see SPEC #SC66A-2.