Nah DOHC VTEC noticable performance gain, you can actually feel and hear the crossover, SOHC VTEC is baby vtec, all whine and little in gain, hear the noise but not the feel If its anything like my D16Y1, you'll hear it "crossover" at around what Aaron said @ 4K.

The only Coupes available in 98 were the VTis so you "should" have Baby VTEC at the least otherwise you got smacked lol