I've owned muscle cars with 7+ liter engines, one even ran on av gas...none of them even remotely sounded like that. To me, that video doesn't even sound like a car. (even with Sony headphones)
A big V8 is violent. It's really too bad that GT5 couldn't tap into that. Everyone, at least once, deserves to take a quick ride in something as brutal and unsophisticated as an overpowered muscle car. There's nothing quite like it.
Here's a video of a Ford 427 (7.0L), skip to 0:45:
http://www.youtube.com/watch?v=CjX_4K0rUtw&feature=related