So on the old Ti-Force, what makes it a Sumo?
On the Orient Express what makes it a Sumo?
My experience mostly on Gen I Busas.
HMF Big Bird and it sounded great at idle and cruising but was ripping loud under WOT. Not a whole lot of canister diameter.
Brock Gen III has a great sound all around. Yoshimura a little lacking in deepness and sounds more like a litre bike.
Akrapovic was a tad milder than Brock but more civilized at idle and cruising.
Tsukigi seemed veryquiet on a Gen II s when idling and cruising but under WOT sounded sort of like a Yosh on steroids.
Muzzy seemed similar to Yosh but a tad raspier.
D&D is the mini me of HMF. Small diameter pipes and tiny diameter canister. Makes the bike sound like a 750 under WOT. Just plain obnoxious.
My modded stock header 4-2-1 and fully modded stock canister sounds between between a Yosh and Muzzy. Maybe a tad deeper.