EMP Stewart Water Pump

Comparison of EMP Stewart water pump and OEM on E39 530i.

The EMP Stewart water pump is a high performance all metal pump that comes with lifetime warranty. They claim 20% increased water flow over OEM which works well with larger pulleys for maximum performance.

I have been using the EMP Stewart water pump for over 10K miles and hope to get many more miles. It's not cheap at $175 - $195, but the benefits outweigh the costs.

Used on my M54B30 engine and will fit any related engines.

High quality construction and looks great

Beefier than OEM and larger impeller

Installation is the same as OEM. I highly suggest buying an aftermarket aluminum pulley instead of using the OEM plastic one. Since you have removed everything to get to the water pump, replace the pulley to prevent it from cracking over time.

This pump is a E36 M3 favorite with lower drag and more efficient cooling. Many E36 M3 drivers in my BMWCCA club swear by this pump on their tracking days.