I don't belive r and d has a 3 inch elbow/downpipe for the 085 ats turbo I think that's just the factory/093 turbo. Ww2 I think just fits 088 ats and factory/093. @typ4 can usually do just about anything to a turbo system though, I'm currently enjoying his turbo work to my factory system
Not sure about 085 but with enough fuel it will they will All boost, I could get 20psi on my 088 and they are kinda similar. That's with a 90cc and stage1's. With my maxed out pump I could get about 15psi with it