more airflow, better control over intake, etc, but by the same token its harder to tune, more prone to faults (you'll have 6 things to go wrong instead of one) and you'll need to upgrade your TPS, ECU etc.
The R32 GT-B came with an RB26DE with GTR individual throttle bodies, and there are adapter kits for L28 hex throttle bodies onto RB's available in japan...
dunno if its worth all that effort for an N/A.