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The SPEC aluminum flywheel for 2001–2008 Honda Civic Si with K‑series engines and 2002–2005 Acura RSX (Type S and non‑Type S) applications is a direct replacement that preserves clutch fitment while using aluminum construction. It serves as a lighter alternative to many steel units, providing the typical flywheel purpose of reducing rotating mass for crisper throttle response and more immediate engine feel in street and track setups.
Spec 01-08 Honda Civic SI K-series / 02-05 Acura RSX TypeS/Non TypeS Aluminum Flywheel
