anyone used/using a Audi wastegate
 

I was looking around at the ol' pick and pull today and they had a 80' Audi 5000 with the external wastegate. I can get it for free basically. What the thing set at to open at? I'm getting a SSautocrap manifold and I know all the bad things about these but the one I'm picking up for 70 shipped has already been fixed(braces welded in and etc..) before all the thing that usual go wrong go wrong. I know the manifold has a tial WG flange but I can get the audi flange welded on but would it be worth it?