The s475 you're running now is a big frame s400 and uses a 96mm turbine wheel and 1.32 a/r T6 housing. That thing is going to be miserably laggy and nearly undriveable. Guys that run 475s as singles have the small frame 400s which use either a 83mm or 87mm turbine wheel with t4 housings. Unfortunately, you can't convert yours to the smaller turbine section you'd want as a single because the bearing housings are different.
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Mike what all did you have to have done to your s475? BTW nice run Friday night:thumb: