You have no-abs. If you did you would see the large ABS distrubution/controller(mechanical) box in front of the windshield wiper motor (opposite side of brake MC/booster).
If you check the FSM it has specs for the booster, and I believe the ABS is larger (therefore an upgrade?) I personnaly am running a S13 ABS booster and a Z32 ABS MC (re-fitted for non-abs), with no problems
I hope this helps.
EDIT: you can see the ABS distribution block in this thread, 2nd, 5th/6th photos.
http://www.son240sx.ca/forum/v...art=0