Well we have what i would consider the perfect 300+rwkw onevia... super responsive... loves to rev....makes a super lazy 312rwkw on literally std wastegate pressure... big dollar suspension.... but it still sucks to fang round a track compared to the built SR that proceeded it, dont get me wrong the power is nice but the package is not, it is handicapped by the weight over the front wheels.
Remmeber this post is about whether a rb20 in a s series is a good idea... i cant think of one unless the car was CA18DE to start with.
RB20 is good....rb20+s series chassis= poo...