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Zionsville Autosport provide BMW High Performance Water Pump STE30330 BMW High Performance Water Pump is a direct replacement pump design to adapt to a wide range of BMW engines without modification. This includes accepting factory fan clutches. The front of the BMW high-performance water pump is the classic BMW appearance that stocks appear to it, while the back is all the business. The water flow through the reserve pump is increased by up to 20% • The efficiency is twice that of the factory pump • The parasitic resistance is much smaller than other pumps. Zionsville Autosport noticed that the M54 engine failure due to overheating is more than any previous BMW engine. They think this is the result of a combination of factors such as electronic thermostats and high operating temperatures.