I have had a buzzing noise for a month..sounds like a buzz saw or metal vibration coming from front drivers area.

Noise is constant at 2500 rpm when doing 65 mph or more. When getting up to 45 mph, buzzing occurs at 2500 rpm. Have heard it at a lower lever in between 1500 and 2000 rpm when going slow.

When at 2500 rpm, noise is constant. Buzzing noise only occurs during acceleration only.

Nissan dealer felt it was a section of exhaust pipe but no visible sign of cracks, separations, etc.

Took car to a private mechanic shop - they felt it could be coming from engine area.

I then went to an exhaust/muffler specialist shop where they felt it is not the exhaust system at all, and feel it is coming from the engine blower and likely the supercharger.

Supercharger was fully replaced by Nissan a few years ago. This is a new buzzing noise, cannot figure out what is wrong. Nissan intends to recheck problem but they don't seem to know what it is. HELP! Any ideas if it's not the exhaust?