cant give the exact model number but it's a 1.5dohc engine in the 96 cielo
what i would like to increase is it's acceleration(icantspell!) through the gears. ive timed the accel from 0-100km a few times and have come up with a time around 9.8-11.1 (9.8 with a good launch)
so yeh, extractors and a straight threw cat you say would incease accel?