I was confused when my title said GTS on it, apparently they all say "GT/GTS". If your car doesn't have fogs, has the V6 seats and steering wheel and doesn't have a spoiler, its probably a GTS. If it doesn't have ABS brakes, its deffinetly a GTS. ABS is the only thing that wasn't an option on the GTS'
that won't matter Trav, like 1TallMF said, the ABS is the only surefire way to tell, you can order a GTS to have any options you want from the factory. I have a friend with no air conditioning or cruise, but he's got GT seats and power everything...
A GTS will carry the same GT badge as the fully optioned version