Maybe hes meanin the Machs? I'd say its easy cause they have a shaker... but um I put one on mine, I'd say because the machs have a painted spoiler, but others have done that... The seats are the easiest way to tell the difference on the 03/04 Machs and GTs IF you cant see the obvious difference in the engine bay.
The 05's are 300+ HP but those are obvious...
If youre looking for a GT it should have GT badging no chin spoiler and be a 99+ if you want 260 FWHP stock, if you want the 300+ HP stock get a Mach1 wich should have classic looking seats, a different insturment cluster, silver trim around the stereo, chin spoiler, shaker scoop, Either a pony on the fender or an anneversiary pony, mach1 badgind on the trunk lid... I'd be really upset to find a dealer selling a GT as a MAch if it had the appearance copied... check VINs to cover your butt