Hmm... good question.
The first really WOW moment I remember was driving the '66 Shelby Cobra for the first time. I don't really remember how I even got it so early, maybe I bought it, but it was pretty early on in my play through. Up to that point I was just using pretty normal, modern, cars.
Then, I got in the Cobra and it really felt like I was driving a car, with flaws and quirks and it's own attitude. I was, and still am, amazed at how a videogame can communicate those sensations.
Hi guys just asking what blows your socks off in GT5?