Sig_Fiend

I'd ask yourself how much power you're looking for. Under 600whp, T3 flange is fine. Over 600whp, definitely go T4 as it's just easier, more options, etc. T4 divided is even better and can result in better transient response. Something like a Tial v-band housing would be another excellent choice, making install and adjustment considerably easier. One thing to watch out for is coming up with a turbo combination that is a severe mismatch, or basically a configuration on the extreme end of things. People sometimes fall into the method of thinking that if choosing one thing improves a certain aspect, going to the extreme in that direction is going to make it that much better. One way I see this a lot is people tend to size housings on turbos too small for the task at hand, thinking it's going to gain them a huge improvement in response. In reality, I've actually seen a few situations where smaller housings have actually increased lag. Synthtk's recommendation would make for an excellent setup.