Competition Clutch Ultra Lightweight Steel Flywheels (STU suffix) are recommended for forced induction and/or track and rally racing applications. This flywheel is machined with less material to assist in quicker revving capabilities. Well-suited for Stage 3 and up clutch applications. Made of 4140 forged steel and are a one-piece design. All flywheels are SFI certified. Not all applications have the ST and STU versions available. Flywheel weights vary from 8lbs to 18lbs depending on application.
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This Part Fits:

Year	Make	Model	Submodel
1999	Mazda	Miata	10th Anniversary
1994-1997,1999-2005	Mazda	Miata	Base
2000-2005	Mazda	Miata	LS
1994-1997	Mazda	Miata	M Edition
2004-2005	Mazda	Miata	Mazdaspeed
2000-2003	Mazda	Miata	SE
2003	Mazda	Miata	Shinsen
1997	Mazda	Miata	STO