Competition Clutch Lightweight Steel Flywheels (ST suffix) are recommended for naturally aspirated and/or street driven applications. This flywheel preserves low-end torque and driveability. Well-suited for Gravity, Stage 1 and Stage 2 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
2004-2014	Subaru	Impreza	WRX STI
2007,2011-2014	Subaru	Impreza	WRX STI Limited
2010	Subaru	Impreza	WRX STI Special Edition
2015-2016	Subaru	WRX STI	Base
2015	Subaru	WRX STI	Launch Edition
2015-2016	Subaru	WRX STI	Limited
2016	Subaru	WRX STI	Series.HyperBlue