I just asked this question several weeks ago...they ran like upper 14's stock...but with a pulley and intake they can be down to 13's. 12's is very possible in a GTP, but there has to be a decent amount of mods. There are some GTP websites that say there are GTP's running 11's too.

99 Mystique LS T-Red ATX Duratec Mods: Hella stereo Mods K & N air filter w/intake pipe www.sounddomain.com/id/jongordo8