Spec R "GT" comes with the leather seats sunroof, high spoiler, chromed wheels (not that chrome its just bright silver) chromed interior bits...metal pedals
normal Spec R compared to Spec S is
Spec R has sunroof, 6 CD stacker, rear spoiler, sideskirts thats about it (Spec S has just a cd player and no sunroof/spoiler/sideskirts)
i think from memory the spec s is about 40kgs lighter or something like that
basically the GT spec just adds
high spoiler
chromed wheels
chromed interior
metal pedals
leather seats at front