Originally Posted by
skullzaflare
That is the "water outlet" where the thermostat goes, the piece you bought bolts at the top of the engine by the injection pump. (im interested if you wanna sell it lol)
d55 and d56 water outlet (thermostat on waterpump) are the same
I could be wrong, but i recall reading the mains were bigger, i know the g54 is 60mm, but i think the d55 is 66mm
G54 thermo housing MIGHT have same bolt pattern, however g54 thermo housing turns almost 90 off intake. The d55 is straight off the water pump