I want to clearify somemore, I would go with a 58-60mm inducer if you want to run a S300 series turbo and run the current fuel set-up. Prime reason is for awesome spool-ups, but will limit top-end power. That primary will slow down intial spool-up, some, just for a half second.

If you want the 62, the only trade off is you'll have abit slower spool with the current set-up. A garrett seems to spool faster than the bushing bearing turbos, so its more forgiving if you go abit bigger. If you need a S362, and twins go with a tighter turbine housing.

S358 is max flow is 58 lbs/min
S360 is max flow is 69lbs/min
S362 is max flow is 75lbs/min

GT35 is rated at 60 lbs/min

This is off the Borgwarner data sheet and garrett web page. Stock HX-35 is around 50lbs/min area. This data depends on who rates them and where compressor choke seems to area occurs (excessive compressor discharge heat)

I want to try a K-31, but with the wastegate actuvator flipped. So that its open for low boost operation and will be closed at above 5-10psi of boost. Just so you don't loose the decent spool-up of a single, but have the top end of twins. Thats my only issue with my S366 is that I can't do that, but I could run another external gate and do that.