at the moment i can only comment on what it was like to go from a 1.8 litre silvia turbo, into a r33 gts-t. The silvia was fast when on boost, but when off had nothing. I found the r33's have heaps torque compared to the 1.8.
When i am finished putting the rb25det in the silvia, i think it will feel a lot quicker than both. I have never been in one, but i am dieing to get it going.
what i been told is that the car after the conversion just love wheelspin. So light in the arse end, and with more torque, and bigger hp is just a handfull to drive.
but i shell know when i get it going.
But i actually like r33's more for there ride too, smooth, handles well, etc. i think my car now weighs in at around 1300 kg's so i been told. and distribution has switched from 48 % at front to 52 % at back, too 52 % at front to 48 % at back.
anyways, i'd go the r33 if i had another chance. more potential, plus easy to mod.