BlackBoost Coolant Wide Open Thermostat for Mercedes-Benz S550 (W221) M278 4.7L V8 BiTurbo (2011 – 2013) Polaris RZR Reflective panels on the harness

Reflective panels on the harness and rear logo

Alpinestars includes a micro USB charger for quick recharging

Top tongue and collar constructed from leather for enhanced comfort

Interior: Completely removable and washable

low noise level no matter what speed

BlackBoost Coolant Wide Open Thermostat for Mercedes-Benz S550 (W221) M278 4.7L V8 BiTurbo (2011 – 2013) Polaris RZR Reflective panels on the harnessBlackBoost Coolant Wide Open Thermostat for Mercedes Benz S550 (W221) M278 4. 7L V8 BiTurbo (2011 2013) Racing Coolant Thermostat. With BlackBoost Racing Coolant Thermostat the coolant circulation with the radiator is always at 100% open. The factory coolant thermostat opens at 100C 212F. Only for racing application, not recommended be used under very cold weather conditions. Note : Prior to check out, please click here to confirm product