2007 BMW K1200S exhaust

My 2007 BMW K1200S with a mid-length slip-on muffler I got off Amazon. It has a 51mm inlet, had to get it opened up by 2mm to fit, only cost $5 at a local muffler shop (took the muffler and mid-pipe to make sure the muffler fit once they were done). Also removed the dB killer. Fast-forward to the 6:00 and 9:40 marks to hear me revving it out, best to listen on headphones. I'm still figuring out the action camera / external mike setup, so apologies for the background noise. I think in this video I had the camera mounted on the chin of my helmet, with an external mike inside the helmet.