サウンドインサートキット YJP R-11 マフラー (INS-YJP-04-K)

The set screw holds everything snugly in place, so there’s no rattling even after a few weeks of riding. My R-11 sounds noticeably quieter now, and the included collar made alignment a breeze. Exactly what I needed to dial in the noise level.

Installing this was straightforward — the set screw and loc fit perfectly into my existing muffler. Exactly the sound restriction change I needed for my setup.

The low-volume insert kit dropped the exhaust note to a much more bearable level, and the collar slid on without any fiddly alignment. Took about ten minutes to swap with the included set screw, solved exactly what I needed.