Thermostat Housing?

[jra4e]

i did the jdm cyclone swap, everything is almost ready to go, but i have a problem, i switched over to my usdm thermostat housing, and now i have an extra hose coming off of it, it is right below the hose which goes to the turbo. does anyone have any idea where it goes or should i put the jdm housing back on and switch the top half around and use the usdm top half, since it has the thermo cap on it?

thanks

 

[candela]

what kind of oil cooler are you running?

 

[jra4e]

im gonna run the air oil cooler, i was thinking that the line might be for the oil cooler, but i didnt put too much thought into it, my old motor had the water oil cooler