For what its worth, my only power mods were o/r h-pipe, flowmaster mufflers and cai, and i ran 14.2@96 w/ 2.01 60' on Nitto 315 drag radials. I just installed 3.73 gears and a new flowmaster catback with al 2.5" tubing as opposed to the choked up 2.25" tubing with the welded in flows. Im hoping i can squeak into the 13's fairly easily with only those mods, and if not, pullies will get me there although i dont think its necessary.
Also, i have about 130-140 lbs of weight reduction. Aftermarket seats, o/r h-pipe is about 40 lbs lighter, all a/c stuff ripped out, aftermarket fiberglass hood, no spare/jack/carpet/trunk mat, etc