iv seen these vacuum systems on many all motor setups to relieve crank case pressure via exhaust vacuum... gains of 10 hp have been seen.... just wondering if any one has tried this with boost and if so what kind of vacuum should in the exhaust to pull the pressure out
vacuum relief shown in picture from dtr header page top image w/ blue line
http://dtrfab.com/headers/

 

Hey look, its team Holland racings new manifold. I wouldnt suggest running it like this on a turbo car unless you incorporated a box that would hold excess oil pushed out.