These are pictures of the Mock up Engine. There are Mega pictures in my TT Thread, see my signature.
You can see the -4an feed lines to the turbo's. There is an .050 Restrictor you can see "the silver fittings" on each line at the back of the blocks oil feed. I have recently removed those restrictors and put new Restrictors the bolt to the turbo and accept the -4an fittings. Those new restrictors are .060. I used -10an Drains to the front of the oil pan that is plenty above the oil level in the pan for drain back.