yesterday I installed my frantz oil bypass setup. Used -4 feed and return lines going from the turbo feed to the oil fill cap. The filter has a built in restricted and my pressure gauge is teed off the oil feed aswell just to make sure I was pulling turbo pressure away. I'm making the return oil fill cap from an aluminum one but for now I used the factory plastic one. The cool piece of info I found to save money is this: they sell a oil fill cap for a 6.0 with threads to screw a fitting into but it's expensive. Buy one for a Honda k series motor (rsx,Crv, element) thy use the exact same cap as our trucks and way cheaper.