Anyone ever ran a gutted stock muffler on a 200x? I was doing some hard riding one day (lost my swingarm skidplate too!)and started hearing a horrible rattle and i never could find it, one day in the shop i saw the core laying in the bottom of the muffler so i opened it up with pliers and pulled it out and just decided to run it and in my opinion it sounds really good! And makes more bottom end power for sure. Best of all it was free