15.5s is a tough thing to do. Look at the list of mods that I currently have and I'm running 15.6s. Went to the track last Wednesday night and pulled two 15.67s and one 15.64 with 2.2x 60' times. I also felt that my launch could have been much better. I'm expecting to have 2.1 60' times the next time I go out.

Power to weight ratio is a big deal as well. It takes a pretty big gain in HP (read: 5-8hp gain) to drop a tenth off your time. But then again, I've got the heavy ass GS with power everything except for seats. My car is 3065lbs with me and a 1/4 tank of gas.

97 Eclipse GS-15.463@88.57MPH - RIP
92 Talon TSi AWD-12.927@105.47MPH