I have a stock LR exhaust. Better than the ProLine, not as good as free-flow, but cheaper!
I'll have to inspect it, and maybe take it to get looked at. The good news is that it was only a bit dirty when I installed the motor, so I should be able to see if there is any noticeable change in how much oil is in there.
Jason, when you got the VNT, do you think it was worth it for the money? I think I remember that you can also fit larger turbos to the same spot. I'm really not worried about upgrades yet, just want to get on the road! But if something breaks, I will look to the upgrades as a replacement.