Comes with a Motorad 160* thermostat. Our housing moves the bleed hose to follow the same angle as the radiator hose. This cleans up the engine bay by moving the 5/16 hose out of the way and also reroutes the 5/16 hose away from the supercharger belt. We have seen the factory housing break at the 5/16 port during belt failure. These have been a stable in all of our GEN 5 builds for years. Designed, machined, and packaged in Dallas Texas using USA aluminum.