My wife just bought a nice new 2019 N1K. We decided to sport for the factory Akrapovic exhaust for the extra $1250. I get the parts home to find that the DB Killer isn't removable. I contacted my dealership and they won't take the parts back because I had started installing them. I went ahead and finished installing to compare for sound. I was very disappointed, it sounded the same to me... So I did what any angry irrational person in my situation would do...I started drilling holes in them. For those across the pond who have had to deal with the Euro 5 regs, I salute you. Rather than drill out the rivets to get to the DB Killer bolt I just chose to drill a hole big enough to remove the retainer screw. 12mm hole as seen in the pictures. I'm not sure on what to plug the hole with right now. I bit of black duct tape will do for the moment.