98 GSR: 2,672 lbs, and 170 hp.
That's 15.717 hp/weight ratio.
98 prelude: 2,954lbs and 190 hp.
That's 15.547 hp/weight ratio.
If you go to 99 prelude, it has 200 hp, so its 14.77 hp/weight.
Pretty darn close I'd say. I know the Type R is faster, but I would have a hard time finding one, and would cost more than the prelude, at least the one's I've found did.