M3 (stock) - 333hp 252 ft-lbs of torque 3415lbs
GSX (stock) - 210hp 214 ft-lbs of torque 3270lbs

Did you think about the weight diffrence? i know its only 145lbs, then add the
2 guys in the gsx about 280lbs(depending) gsx= 3550lbs
1guy in the m3 about 140(depending) m3=3555lbs then add the 150lbs and 120hp in the M3
thats if everyone weighed 140lbs, so id say no contest with the m3 even if he was running shorter gears maybe in the 1/8 mile but not in the 1/4, thats why you buy a light car and do heavy mods to it, but then you wind up with all ass and not enough car