Granatelli 431000B Features:

Prolong the life of the thermostat by reducing head pressure on the thermostat spring. Made out of 6061-T6 Aluminum. Flush mount bolts allow for a 40 percent increase of coolant flow (The factory housing has a flow reducing bridge inside the casting). 1/2 pipe thread port allows for addition of temperature sensor, pressure sensor or flush mount pipe plug. No gasket required. Uses factory bolts on outside to maintain OE look and function. Can be installed with basic hand tools.