I would have to say 4th gen. they have 190 btw not 185. and honestly I think its all in marketing. what changed to give another 5hp, and then another 5 in 99+. its already been proven that the header was in fact the same. anyway the only place I have seen a 4g vtec slower in the 1/4 mile was from fastball's link. which compared both obdII cars. so basically what Im saying is the 93-95 is quicker then 97+.