LeoVince dB killer/ baffle for the stock slip on or termi slip on to reduce a few dbs if a decat pipe has been fitted It’s this one from LV https://leovince.co.uk/DUCATI-1200-MULTISTRADA-LEOVINCE-DB-BAFFLE_A1FZYU.aspx?nh=3661664 Also fits some 14 models apparently - 30 quid posted
Could be ... but I’d need to find it first ... The link shows the OD . its 46mm - the flange OD will be the same as the original end can , think it’s 53 but you’d need to check