Mishimoto MMTS-E90-07 BMW N52, N54, N55 Engines Racing Thermostat Direct fit for BMW N52, N54, and N55 engines Activates at lower temperature so coolant flows through system earlier Allows for cooler engine temperatures Mishimoto Activation: 165F (74C) / OEM Activation: 206.5F (97C) Mishimoto Lifetime Warranty