I’ve been waiting to see if someone would ever give a go at twincharging an RB.
Trust/Greddy did it on one of their demo cars (R32) many years back. But they used a rotrex type centrifugal charger with T78 turbo. Pretty pointless, you need a rooted type positive displacement charger to fill in the bottom end. Simon Norris is selling what looks like an impressive kit for 4g63’s.