The stock water pump pulley is plastic from the factory and has been known to crack over time from heat cycles and stress. The water pump is an important component of your cooling system, and can leave you stranded if something breaks. This aluminum water pump pulley is a direct replacement to the factory plastic one and is considerably stronger to give you a piece of mind.
Replaces BMW PN 11511730554
Fitment: M50, S50, M52, S52
*Note:This pulley can fit a m54 engine, but you will need a shorter belt (6pK1538) to make this work, due to the larger pulley size.
