Well I removed my cooling lines to install a TCI cooler, and didnt start the car to see whats the supply and which one is the return. I also took off the headers, so I cant start it. Im running new lines as well, and im going to run them behind the header. Im going for the clean look. I beleave the upper is the supply. But im not sure. Thanks!

 

The top line is the return from the cooler to the transmission.