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Return to Parts List Category : B- Small Block Dodge Magnum : Cooling System : Thermostats & Housings MRG 4364 180º 2.125" O.D. HI-FLOW THERMOSTAT HIGHLY RECOMMENDED FOR USE WITH HIGH VOLUME WATER PUMPS $25.57 This is the smaller 2.125" o.d. thermostat. Chrysler/Dodge/Plymouth 180 degrees, high flow. These high performance thermostats are designed to resist large variations in coolant pressure that occur at high RPM's where coolant temperature and coolant pressure fight for control of the thermostat keeping it from opening at its designated temperature. The balanced HP thermostat features all brass and copper construction, and opens at the right temperature regardless of engine RPM