Im thinking of getting a GTR rear spoiler for my boat, reason is the stock GTS-T is really only for looks as it generates bugger all down force but lots of drag, at least the GTR spoiler has some abilty in generating a bit more down force.
I know this because I forgot to close my boot one day at a event, 200kphish down Eastern Creek main straight and when I came in it was still not locked down, I tested how much weight was needed to close it by placing weights on the spoiler and it took 30kg to close it, so it created drag and less than 30kg of downforce.
Using GTR parts in a GTS-T is a smart way to get some easy bolt on mods like brakes,diffs,wheels but badging is a no no, like Holdens with Chev badges, its not a Chev motor its GM, Chevs use GM motors like Buick and Caddies.
Stupid bogans
http://www.gm.com/vehicles/