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The ACT XACT Streetlite ProMass flywheel for select BMW 2009–2013 135i and 335i models is a lighter, serviceable alternative to stock. Materials are redistributed for strength, lower inertia and heat tolerance, favoring street and drag applications. The Streetlite design accepts resurfacing rather than replacement, offering durability and a performance‑oriented reduction in rotating mass.
ACT 09-13 BMW 135i / 09-13 335i XACT Flywheel ProMass
