I bought the full system Rs-4 for my ktm 350. Out of the box I thought the system was a little to loud and rasppy for woods racing. I bought the quiet insert and was a perfect match of throaty and tone for what I was looking for.
Yoshimura Quiet Insert - RS-4
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To this day - everything Yoshimura does revolves around building fast machines and winning races. What motivated Pop's Yoshimura over 50 years ago is the exact same thing that motivates Yoshimura today. Racing and winning. There is no other endeavor that they would rather be engaged in.
- Replacement Low-Volume Insert Kit for Yoshimura RS-4 mufflers.
- Non-spark arrested.
- Decibel reduction depends on application.
- Available as optional kit on applications requiring different sound restrictions.
- Kit includes:
- Low-volume insert tube.
- End-cap collar.
- Set screw.
There have been no questions asked about the Yoshimura Quiet Insert - RS-4.