Looking at a borg warner EFR series. If it's not realistically going to make more than a gen5 swap I think I'm going to order internals and a gen5 and build a motor. I have a friend who is looking into making a 500whp build with a gen5 block, and he's undecided on internals yet. He's also doing some research but at least he has Dyno time.If I remember correctly there were some rare cases of unopened gen2s with 400whp or more. It really comes down to how good your tune is, how safe it is, and keeping IAT's down. How long a stock unopened gen2 will make that kind of power? Who knows. Get yourself an efficient turbo, I don't know where to point you for a good one but don't try to do this with an ancient turbo.