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I have noticed a huge difference on my setup. I originally can of the left of the "T" into a catch can and then into the intake line for the compressor. The problem with that was in pulled so much oil from the VC that the can would fill and get sucked into the compressor. Had to tear my entire turbo and exhaust side apart because I thought I blew the turbo. I didn't but what I did notice is that the valve seals were starting to leak. I am talking new valve seal with less than 15k miles on them.
I went from a 2871r making just under 340 hp with nice linear power, to an hx35 twin scroll and swapped to an external gate. No dyno yet because I just got the exhaust and hot side done but I was able to take it out for a spin with half the old turn and a recalculated fuel map (Its good to have a stand alone) I can not only feel the difference when driving it, but at idle you can hear the air flow from the exhaust evac. Even though the holes for the baffling are small its pulling hard.
I just took all the exhaust apart to look for oil and smell for oil, and nothing.
So while it looks like alot of work it cost me less than 150 bucks to run the exhaust evac. The bung and insert were like 30 from Vibrant, -8 AN hose was like 5, the fittings were 60 from summit, and the welding was 50.
So its not a super expensive upgrade, but then you never have to worry about it, having blow by, or in my case, getting oil into your compressor.
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