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Dont know how much you know about RB engines and they seem rare over there, but in NZ we have a facination with them and put a lot of development into them.
Highest outputs were around the 280-300rwkw mark for RB20's before people start shelving them for 25's, 26's or 30's (RB30E block with either RB25 or RB26 head). The 30's are torque monsters, pumping 300rwkw on as little as 10psi with a GT35/40, with most of our Pro drift competitors pushing around the 400-550rwkw out of them. I dont think any needed to be opened all season.
The standard turbo on your RB20 will have ceramic wheels, meaning any boost over ~13psi for an extended period of time will make the exhaust wheel spin off and spit out the back. A good upgrade are the VG30DET turbos as they have bigger housing, bolt onto your manifold, are steel wheeled and can be highflowed to the numbers you want.
I'm running an RB25 in the same chassis (check my build thread if you want). I can tell you running these things low needs 10-12kg springs in the front due to the heavier 6 cylinder engine over the KA's or SR's. 8kg's seem fine for the rear.
If you ever get sick of the "outboard motor" sound of them, look up a company called Sinco Customs here in New Zealand. They make exhaust manifolds that make these things sound amazing and they come with a lifetime no-crack guarantee. Search Zac Pole on youtube, he's running one of these manifolds on his RB30 and it sounds amazing, especially the clip taken of the front wheels.
Anywho, sorry for the novel, just dont see too many RB swapped S13 chassis on here. Good luck!
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