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Yoshimura RS-4 Signature Series Slip-On - Aluminum Muffler - 264622D320



Delivers huge power at a very light weight
Offers better handling thanks to a lower centralized mass coefficient
Uniquely-styled pentagonal muffler body with a carbon fiber cone end cap
Front cap design functions as a polyresonant chamber to lower dB output while improving mid- to top-end power
Two-staged, stepped baffle
Tapered headpipe delivers optimal flow and performance
Titanium systems include non-spark-arrested 99 dB motocross insert (unless noted)
Mufflers available with glossy carbon fiber, satin titanium or brushed aluminum sleeve
Stainless systems come with 94 dB insert installed (meets AMA competition requirements), 2 meter Max insert in the box

Product Series

Application List

2018 - 2018KTM450 SX-F Factory EditionNone
2018 - 2019HusqvarnaFC450 Rockstar EditionNone
2021 - 2022Gas GasMC 450FNone
2019 - 2019HusqvarnaFX450None
2019 - 2022HusqvarnaFC450None
2016 - 2020KTM450 SX-FNone
2021 - 2022Gas GasEX 450FNone
2016 - 2020KTM450 XC-FNone

Shipping Information

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  • Free Ground Shipping (1 - 5 Days)