1998.5-2022 Cummins -20AN Thermostat Housing Full Send Diesel Glacier diesel external fins and the addition

external fins and the addition of side gussets

The factory slip yoke rear output shaft

We added a silicone lid funnel to isolate the engine heat while tunneling more to your engine

while reducing front-end rake by raising the front of your truck 2 inches

1998.5-2022 Cummins -20AN Thermostat Housing Full Send Diesel Glacier diesel external fins and the additionLooking to plumb your upper radiator hose out of 20AN Braided Hose? Look no further then FSD's fabricated aluminum upper coolant neck. This is a cast aluminum coolant next modified to adapt to a 20AN Hose. Whats Incuded? (1) Fabricated 20AN Thermostat Housing Features: 1998. 5 2022 Cummins 20AN Thermostat Housing 20AN Sold As: Each Note: Does not work with 6. 7 Cummins using the factory exhaust pressure sensor mounted on the factory thermostat housing