well if he drove a NA1, all it takes is bolt ons, test pipe, spare tire/ engine cover removal to drop 100 lbs which only makes the NSX 100lbs heavier than a stock S2K while still maintaining everything on the interior but the nsx will be making anywhere from 260-280whp which is 60-80whp over a S2K.
I would say the reason why the NSX feels more planted is because the car is about 3 inches wider, its lower, it has better aero dynamics, a much slower steering rack, and a more compliant suspension.