This URO Premium aluminum power steering pump pulley (32427553955PRM / ES#4019981) replaces the factory plastic power steering pulley with a machined aluminum unit. The factory plastic pulley on N54-powered cars is a known failure point — it can crack or shatter, leaving the driver without power steering assist — and the aluminum replacement eliminates that failure mode.

Fitment: BMW E82/E88 135i and 1M Coupe, and E90/E91/E92/E93 335i, 335is and 335xi, all fitted with the N54 3.0L twin-turbo engine — not the M52TU/M54-powered E46/E39/E83/E85 models on the original listing.