'95 will have had AST as an available option ('94, too), whether the car has it is more a function of the mindset of whomever was ordering the cars for the dealer and what region of the country it came from. The '95 will have the exterior updates (body colored lowers, new rockers, V8 grille, etc), and Vanos makes a big difference when you're pushing that GM slushbox with that little bitty engine. If it's a luxury package car the interior door panels will be much more durable, too. Other than that and and the normal upgrades along the way, they're pretty much the same. The appearance items always make the '95s look like somewhat newer models.