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The SPEC aluminum flywheel for 2004–2009 Subaru WRX STI applications replaces the stock unit with a lighter aluminum option intended to alter rotational mass for driveline responsiveness. Specified for the 04–09 STI, it suits engines and clutches that match OEM fitment and is supplied as a direct replacement component to maintain compatibility while changing flywheel characteristics for street and track use.
Spec 04-09 STi Aluminum Flywheel
