I kinda liked the vid, all 1960 French arty/farty !!....What I heard, apart from exhaust was TUNE, your bike sounded on tune ( tuned ) IMO........
I've heard lots of 4-into-1 pipes, but I concentrate on tune, not noise/loudness, which is sweet on it's own, but tuned motor cannot be 'hidden' by loud pipes IMO...I heard it most on up-shift, anyone else?, or does anyone else recognise this ??