Part of the issue with doing a proper turbo setup(turbo just after header) is getting it emission certified.

The setup he's trying to build is more like a cat back exhaust.

I'm curious what the ECU will think when the BOV opens and metered air reverses through the MAS. I'm thinking that it will read as additional air intake, and dump in fuel for it as you lift the throttle.

With the BOV spring set stiff enough to remain closed at idle you may get some surges.

I do give props for trying though.

John C.