How loud is the quattro drivetrain?

[Winners Eat Pho]

Coming from a previously modified, slammed, and rattling car, I've come to love moving into adulthood with the finer qualities of the A4. I even got a new set of tires sooner than I had to so I could cut down the road noise. Now... I'm so set on the car being tight and sound (pun), but I seem to hear 'something' other than the regular wind & tire noise. I've come to the conclusion that it must be the drivetrain?

(The wheels bearings are good btw)

[hercfe]

The drivetrain in my B6 is quiet. Almost nonexistent. The engine has a little whine to it though at high rpms. Well, it did, until the full 2.5in exhaust went on. Now it sounds the way it should.

[nramsey]

I've owned Quattro A4s for a cumulative total of 4 years (3 years in a B5 and 1 year in a B7) and can't say I've ever hear a noise that I've attributed to the drivetrain. I'm not sure what about it would make noise really. It doesn't have a transfer case or anything like that.