I was told by a Spyder Tech. that those are not actual catalytic converters but just a "pre-muffler". I saw a photo of one that was cut opened and there were just tubes inside. No cat converter material. They are relatively heavy as are stock mufflers. I don't remember where I saw the cut away photo but this is what I was told. Take it for what it is.
Dunno about that Spyder Tech, nor about your 2016 F3 T Bandito, but the Catalytic Converter or pre-muffler or whatever you want to call it that came off my 2013 RT was
VERY DEFINITELY a catalytic converter with a catalytic honeycomb inside one of those tubes contained inside the box. :lecturef_smilie: Admittedly, it's a
very small amount of catalytic honeycomb; but still, it's
there so it does sorta qualify as being a cat converter, despite the very small amount of converting it might do!!

.
IIRC, there was only about 1.5" or so of honeycomb material filling the inside of the middle one of those 2" dia 'just tubes' contained in the cat converter box - the rest of the box and all the baffles/restrictions on free-flowing exhaust etc are simply there to create sufficient/excessive exhaust back-pressure so that the trapped & choked exhaust gasses will heat up that catalytic honeycomb to the something well over 600°C that's necessary for them to effectively do
anything 'worthwhile'!!

. There again, there's such a
tiny amount of catalyst material in there that for all the excess back-pressure & excessive heat produced, the 'worthwhile' bit in that previous sentence is questionable, as the
tiny amount of catalyst contained will only be capable of 'converting' about 2/5ths of 5/8ths of s**; - altho that too is really not such a biggie, cos most (any large engined Boss Hoss or similar bikes possibly excluded

) modern 4 stroke EFI motorcycle engines are small enough & (can be/should be??) tuned well enough that they produce very little in the way of harmful emissions anyway - there's quite a few 'experts' who argue that the harmful by-products resulting from creating & eventually disposing of the cat converters installed on modern motorcycles
far exceeds anything they may clean out of the exhaust they produce during their working life; but hey, they're ICE's that aren't electric, therefore they must be harmful! :lecturef_smilie: