Yoshimura R&D of America, Inc.

SOUND INSERT KIT 94db RS-4 Muffler, 1.250" (INS-13-K)

SOUND INSERT KIT 94db RS-4 Muffler, 1.250" (INS-13-K) - Main image
$25.8 $40.95 In stock

Category: Replacement Service Parts

  • Replacement Low-Volume Insert Kit for RS-4 Mufflers
  • Non-Spark Arrested
  • Available as optional kit on applications requiring different sound restrictions
  • Decibel reduction depends on application
  • Please see our Insert Chart to confirm fitment for your application
    • Kit Includes:
    • Low-Volume Insert Tube
    • End-cap collar
    • Set screw

*If you have any questions about fitment or applications, please call our Sales Department at 1-800-634-9166.

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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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Returning an item

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.8 / 5 · 5 reviews)

Hazel ★★★★★

It fit perfectly onto my RS-4 muffler and noticeably softened the bark without totally killing the sound. The kit includes everything needed for the swap, which made the whole process straightforward.

George ★★★★★

Took about ten minutes to swap in, and the difference is noticeable right away — the tone is much tamer without killing all the bark. The 94db rating feels about right for my setup, and it’s nice having the option to go quiet for certain areas.

Madison ★★★★★

Slipped right into my RS-4 with no issues and cut the noise just enough for my neighborhood. The 94db rating is spot-on for what I needed.