Well, it's an internally gated turbo [mitsu], and like I said in the OP, I want to fab up a tubular O2 housing, and I know some people claim gains with an external, and others say it's just for noise. I was mainly looking for the fluid dynamics aspects of it like Big J posted, from some one with more knowlege than I. The noise doesn't bother me, but it isn't necessarily a plus for me either.

oh and just FYI[blackshine and big j]...my BOV is recirculated....I'm not one of those 'look at me, my car is turbocharged' guys, I don't want too much unnecessary attention.