my buddy has them on his 5 lug eg and the stopping power is redic. but i think he was saying something about he couldnt fit certain 14's and some 15's but he has 15 inch gab rims and has no problems. the gabs he has are like the REAL jdm rota gt3's

 

you will never feel the difference period.

you will lock up the tires with either setup.

nsx brakes have cooling fins and two pistons which can keep the brakes feeling more constant/even throughout a race.

and either brakes cannot fit 14" wheels