ive been in a 12 sec GTR and the thing sounds absolutley mad!, this one is a genuine aust delivered which has apexi turbos apexi twin exhaust, and larger fmic, mind you a rebuild on one of these isn't cheap, but if you can afford the car you should be able to afford to service it. does some pretty mean nuts with the attessa fuse taken out!!
i wouldn't go so far as saying that a gtst is shit though, rb20s aren't all that hot but there are other engines about the place!