twincharging would be cool...
I drove a twincharged mr2 20V frankenstien.
1.6 litre bottom end, 20 valve head, hiflowed ct26 turbo, 4agze supercharger.
the cool thing about it was at 1000rpm the supecharger would kick in and you felt like you were hitting full boost, just when you thought it would level out, then the turbo hit full boost at 4500 and christ! hang on...
Scared the shit outta me. the car weighed bout 900kg and put out 189rwkw
twincharging the rb20 would give you great bottomend/midrange.
the plumbing would be a bit of a headache tho:)