I've done my research on clutch buzz and keep reading that it happens when you downshift or decelerate. My buzzing noise happens when I'm sitting still. I hear it when I'm driving some but not its not that loud until I stop. Does this sound right?

 

As far as I know clutch buzz occurs when you let off the throttle at high rpm. This is especially loud in my '00 in third gear as the revs come down from anywhere above 5k.

 

mine only buzzs when in gear and between 2,500 and 3,000 rpm.. anything outside that rev range and it doesnt buzz..

 

Mine buzzes like shit on decel in multiple gears but NEVER when sitting still, absolutely not related

 

Can you post a video? Clutch buzz only happens on decel. It shouldn't be happening when sitting still. Do you still have the stock cat? Possible the honeycombs have come loose and are rattling. Or even the header heat sheilds.