Searched but found no sure answer.
This is for an S52 M3 US motor.
I already discarded my throttle body lines so I want to use the barb from the cyl head and the black pipe that sits along the intake side. I do not know which one is the feed and return.

Next on the turbo bearing housing, does it really matter which side is a "feed/return" for water that is pumped around it? This answer would really solve the question above right?
Thanks

in all reality. eiother or both both questions.

there is a "right way" but for it to do its job, there is no right way.

basically the head is the feed and the pipe is the return. Not sure about the turbo though.

It can go either way :)

it can but the metal pipe defenitly is the return for the cooling system. It goes into the back of the water pump and the water is then pumped across teh head.

You can feed off the plug on the exhaust side of the block and return into the black pipe... I think thats how I saw it done.