Is there much of a performance difference between a T3/T04E w/ a .63 A/R turbine housing and a .63 A/R compressor housing and 57 trim
a .63 A/R turbine housing and .63 A/r compressor housing and 60 trim
a .63 A/R turbine housing and a .50 A/R compressor housing and 50 trim
Which one would be better suited for my ser? TIA

I have seen .63's usually coupled with the 50 trim compressor. Generally the .82's will be mated to the 57 or 60 trim compressor. You won't see much difference between the 57 and 60 trim performance wise. If you are looking for 300 - 325 HP the .63 with the 50 trim should work well. If you have goals of making more HP than that, I would consider the .82 housing with the 57 or 60 trim compressor.