from nothing to 2 tenths tops betwen lx and GT...lx coupe is almost 400 lbs lighter than a gt though.
up to a second slower in an aod vs. 5-speed.
and i have owned 2 5-speeds, 2 aod's , a GT , 2 notchbacks , and a 'vert
so i know from track times and same driver...not from "my neighbors cousin knows a dude that told his sister"
oh and btw...my aod GT ran 14.40's w/ no belt and cheaters on 3.73's
my stock as a rock 5-speed notch ran 14.27 on street tires and 2.73's
my stock 'vert ran 15.20's w/ 3.73 and street tires
my old 5-speed notch ran 13.20's w/ 4.10's and cheaters