I am assuming that you are trying to put in a Frantz TP filter, a bypass filter? I would not use the turbo feed or return lines for a bypass feed personally, the poor turbo needs all the flow it can get. I would take a look at the oil cooler lines, tee into the line going to or coming from the cooler, it won't make any difference. Just be sure that you do not obstruct the flow much with your fittings, you are trying to pull a part of the flow is all. Remember that the return to the engine needs to be into a non-pressurized part of the engine, tee-ing the return into the other cooler line will result in zero flow through the bypass. The oil filler cap can be drilled and tapped for the return or you can get a drain plug kit for a trasmission pan at your local parts store and put it into the valvecover. Hope this helps.