Turbo experts can ya help me.
 

Im looking at turbos im wanting to uprade as I will eventualy be putting some good parts on my ride. Im wanting to make about mid 400-500+ HP. I find some turbo charts and graphs but want to make sre im understanding them corectly. There has to be a way to mathmaticaly size your turbine/compressor wheel and the houseings for how much your engine is pushing out and where you want it yes? I was looking at the garret turbos. I kinda like the idea of haveing coolent flowing to cool the turbo like the garret does. What are some of yalls thoughts on a stanless steal turbine or ceramic coating the turbine and downpipe? Thanks guys!

I think its a retarded amount of overkill for the power you want to make.

a 62/65/12 will make 600 with a set of 90hp tips i know so just the trubo should put in that ball park

Thats a little small of a turbo to make 600hp. Ive seen several making 500hp with a Phat Shaft 62.

a 57/65 or 62/68 will make the power you want to make. but 600HP is out of a S300Gs map range. a S300 with a 62/71 setup or 64/71 can make 600HP though.