We have noted more M54 engine failures due to overheating than on any of BMW's previous engines. We believe this is due to a combination of factors including the electronic thermostat and high operating temperatures. Our M54 Competition Thermostat Plate Kit is designed to return the selection of normal engine operating temperature to the owner/builder and improve engine longevity by replacing the failure prone electronically-controlled thermostat with a mechanical unit. [See Full Description Below]

The Z4 Aluminum Radiator is suited for the 2.5i M54 and 3.0i M54 Z4s equipped with automatic transmissions. It also fits all S54 Z4 M Coupes and M Roadsters. [See Full Description Below]

Radiators and shroud kits are built to order. Lead-time varies.