The Mandello Museum is well worth a look if you are in the area - it was free to enter when we visted some years ago, but was only open from 3pm-4pm Monday to Friday. It isn't sign posted, but you lurk near the factory exit & at 3pm a chap opens an unmarked side door in the side of the building. Climb the stairs inside & the museum is a huge area on the first floor. IIRC there is an example of every road bike they have made, plus a lot of the factory racing bikes. Very little info & the bikes are just rowed up as in a showroom. Come 4pm the staff are shooing you out of the door. All rather bizarre, but typical of Moto Guzzi "doing it their way". I have some pictures somewhere - could dig them out if there is interest ?
There was one running at the last Biker's Classics at Spa that I attended. IIRC it was being ridden by John Surtees. A bit smoky when it started up but, as said, not that loud.