Engine buzz under load?

[Yury]

Dropped by a dealer this morning. They tightened up exhaust heat shields, but that didn't make much difference.
Also showed it to my mechanic. He pronounced it normal, and said that what I am hearing is a sound of the air intake. I drove around this this in my head and I agree that this sound may be described as air rushing in through a small opening. Psychology is a funny thing :)
He did mention that the intake design on these is 'tricky' (he said that in russian, but that's the best translation)