Banks al the way for me. I have two of them. I keep a spare everything. When I needed to rebuild my first Banks wastegated turbo I found out it was nope... We don't sell parts but we can sell you a new bolton turbo for $1100.00... So I bought it and then went about rebuilding my other turbo. The hot side wheel was damaged and thats part of the shaft so.... It was very tuff finding the parts. Its a mistubishi turbo and the factory overseas will sell you anything you give them the part number for.... Crappy way to make a living I'm thinking. The rebuild kits for the Banks units are plentiful and cheap. The aluminum cold side wheel is easy and plentiful to find also. Just don't think your going to find the hot wheel and shaft combo anywhere easy.... BTW the hot wheel is inconel material too.... Really a great but expensive material. Don't try to rebuild these turbos at home. They need to be balanced. They spin higher than around 120,000 rpm. Thats 2000 rpm per second.....
If I was spinning that fast I guess I would whistle too.
BTW ebay has a place listed thats selling new Banks turbo kits way less than the Banks factory is. They are in Torrance Ca too. If you install a turbo we don't find the need for a muffler because the turbo chops up the sound signiture so well. Most around here just run a 3 or 4 inch straight pipe and they are not loud at all.