Snowman, My 2 cents would be for a 60-1 p trim w/.84 ar. I ran one of these for years will make 500+ HP. but is very good on the street. 15-18 psi boost no intercooler, blow through.
This bigger A/R keeps it from going to boost just in normal driving, but roll your foot into the gas and it goes to full boost instantly. At a stop sign hold the brake and it will go to boost.
Yes a .63 ar will boost quicker but hurt overall performance, I did not need it on my setup.
The turbine wheel is more important, the ar just fine tunes it.
