Bloody hell, he’s at it again, riding his motorbike up and down the lane! . .. Hold on, he’s on a Vincent, haven’t seen one of those in years! Ooo, that’s a proper sounding motorbike!
Exhaust note is more to do with the type of silencers in this case. They look like BSA Goldstar pattern. I have a 1965 Honda CB77 with Goldstar pattern silencers and the tone is not disimilar.