That car was built with no sound deadening to keep it as light as possible !
Indeed!

All I can say is it's a good thing the B-series mounts with the exhaust at the front; the intake is loud enough, sweet though it is! A few mods and it might as well sound like a competition car inside.
Which has reminded me... My brief stint in the passenger-side of a Caterham Seven (of some description) was a bit of an eye-opener, but the sound was not that in-your-face - largely because I was wearing a "lid". The only wind noise I could really hear was that buffeting off my noggin! Similar to being on a bike, really.
In GT5, are we to assume that we're supposed to be wearing a helmet in the car, too? In that case, the wind noise (assuming it's not an open top car) ought to be greatly reduced, relative to the engine sound, squealing etc. Then again, that might depend on the type of helmet, e.g. full-face vs., er, open-face...? It might have been discussed before.
Anybody with actual experience?
EDIT: @ speedfreak69, analog: very good point about the pyschological thing; it's interesting thinking about whether "realistic" sounds coming from a set of speakers is actually going to sound realistic at all, for whatever reason (for some sources it works, for others, not so much.) It's probably part of the reason NFS sounds the way it does now, even neglecting artistic direction. Forza's not a million miles away, either, but it isn't anywhere near as "glitzy".
This is why I think the clinical sound in GTs past is due to a certain artistic direction, more than anything else.