Ok let me start off by saying I don't own a vr4, but I plan to once i get back from deployment. I plan on running a Holset HE351VE turbo, they have a weird flange pattern to them its not quite t3 and its not quite t4, I ordered a flange for the turbo already. The thing that I am stuck on is this, what is the difference between a T3/T4 exhaust manifold and a regularly flanged dsm manifold? The flange I have is made of stainless steel exhaust manifold with the regular dsm flange could I just cut the flange off and have mine welded on with no negative effect or would it be best just to go and get a T3/T4 manifold and cut the flange off in order to get the best possible flow. That leads me to my next question, if its best just to go with the T3/T4 manifold, I know you can weld stainless to cast as long as the welder does the process correctly, I am looking at the ERL manifold, Is there enough room in the engine bay for that? I was thinking I would probably have to go with a civic radiator, just because of the turbo size though.