Man, just got my turbo and manifold back from MPI Nick and he does kickass work.
He ported and polished my manifold and then he ports and polishes the turbo and stuffs GT28RS guts into it. It's a damn fine little turbo made all that much better by Nick. It is a very affordable alternative.
He also ceramic coats it as well. According to Nick it can flow enough air to put down 400HP. Please don't flame me for that it is what I was told and I am inclined to believe him. Of course it would take other mods to get to that level (and I never will) but for my little 300WHP goal I am sure it will do just fine.
I can't wait to get my car back together.
Here is a good place to read more about this upgrade.
http://www.msprotege.com/forum/showthread.php?t=123615830&highlight=Nick+upgrade