I think I’ve found another, besides sheet metal horn brackets..
Double walled headpipes, w bends aft of the crossover
Tap tapping around w a hammer, made me slip off the muffler, the headpipe altogether
Tapping around the exit at 90 degree spots (red marks in foto) produced the buzz ive been hearing ….(see white noise in foto)
Interior wall has given up somewhere, seems like..2007 model year, sat for 10..
Guzzi markings on the outside w numbers, tap to enlarge
The arse end ..what’s not visible is how different the inside wall bends are to the outside wall
Exhaust valve at 17k miles running 4-7k rpm regular unleaded
“It’s those LaFranconi mufflers that makes me do it, your honor…really, sir, I promise I won’t do it again…”