Heh, it's mildly on topic, but I raced my friend with an 89 prelude Si after he got his mods last weekend (custom CAI, DC headers, straight pipe exhaust, new tires, etc) and he kept up pretty damn well until i hit vtec in 2nd gear, caught up to him, and then blew by on top end at the end of the 1/4 mi. it was pretty surprising to see him not in my rear view so fast.

anyway, some guy saw us dragging so he asked us if he could join. sure enough, it's an accord like your 91 with an H22a swap in it. i sacrificed my friend and volunteered him for a run for $5 against this guy and he agreed. Needless to say, the 89 prelude si still beat the H22 accord and my buddy earned $5 (won both runs)

so that's it - for some strange reason, putting a prelude engine in a chasis about the same weight of it and a tranny that's not as great or new doesn't make you faster than a stock prelude...or in this case, a modified old one.