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David,
I know I had also wondered about that before...
What I know is that oil metering jets are one way jets. I also know what when air is being pulled by the turbo, it will create vacuum by the intake nipple. I'm assuming the vacuum lines on the oil jets are facilitating oil injection at higher load (under boost). I've seen people run this line to LIM manifold nipple, but I think when you do that it does the opposite affect and could also distroy the oil injectors. Why?? Well, because intake manifold create higher vacuum and pressure and I don't think these oil jets are made to handle big changes in pressure and vacuum like that. I've checked over 20 jets in my life time and I have to say, about 50% of them were bad.. Either I couldn't blow thru them or it would flow both directions... As we all know these little things are there for a reason...
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