Lightweight Aluminum Single-Mass Flywheel

The JB Racing 520-180-240 is a lightweight aluminum flywheel designed to enhance engine performance. This single-mass unit replaces the stock dual-mass flywheel, significantly reducing rotational mass and Moment of Inertia (MOI). Crafted from billet aluminum, this flywheel weighs only 10 lbs, a substantial decrease from the stock flywheel's 25 lbs. This reduction in mass allows the engine to spin up faster, resulting in quicker acceleration, snappier gear changes, and more effortless rev-matching. The single-mass design also replicates key OEM dimensions, ensuring compatibility with original clutch components. This JB Racing flywheel is specifically designed for the BMW E46 M3 S54 3.2L.