Ive seen a pic of one not long ago i just cant place my finger on where to copy it
its like the monaro cai because it seals around the headlight but instead of being 'open' at the top it seals totally around the headlight
but if u have a alloytec it will have the rad overflow bottle between the airbox and headlight and thus u will have to cut a hole to fit the GTS CAI
to sorta sum it up a the CAI off a GTS is similar to a Monaro CAI but just seals itself a hell of a lot better from the engine bay
hope that kinda helps