hey 600 is this a rb25 or an rb26?
I just clicked b4 I chastised inasnt's post and he is right
the ss are 320-350 hp rated the rs I not to sure but say 400 450.
If your on a rb 25 gt 3040 or bigger is required on an rb 26 the ss would be adequete but you would need to run high boost to make the big power. but that is no problem provided the car is tuned well ie no detonation.
cheers
meggala
a t51 kai would be nice on either motor spl being a bit to big for what you want