2M-MAX RS-4D 消音器聲音插入套件，底部 0.750吋 (INS-BF-K)

I swapped out the stock insert on my RS-4D and this low-volume kit made a noticeable difference in sound without being too restrictive. The 0.750" bottom outlet lined up smoothly with my end cap, and the decibel reduction was exactly what I needed for quieter riding.

The bottom outlet design fit right onto the end-cap without any fuss, and the decibel reduction is exactly what I needed for the neighborhood. Took about twenty minutes to swap out, and now the idle is noticeably quieter without losing that deep tone.

Installed this on my RS-4D to tame the sound a bit, and the fit on the bottom outlet was spot-on with no modifications needed. It's noticeably quieter now, which was exactly what I was after in my neighborhood.