Today I removed the db-killer from my Akrapovic 2017 Euro 4. Just drill a 2mm hole in the carbon, if you look inside you can see where the bolt sits. Go up in size till you hit 10mm.
Remove the hex bolt, the bolt is welded "tacked?" but it will easily break off, pull out the db-killer. Buy some kind of plug and cover the hole. Literally took me 7 minutes.
Make sure you mask the carbon with covering tape of some kind before drilling.