Yoshimura R&D of America, Inc.

SOUND INSERT KIT RS-4 Muffler, 1.500" RING (INS-23-K)

SOUND INSERT KIT RS-4 Muffler, 1.500" RING (INS-23-K) - Main image
$25.39 $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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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (5.0 / 5 · 5 reviews)

Emily ★★★★★

Swapped these into my RS-4 mufflers to meet stricter track noise limits, and the drop in sound was immediate and noticeable. The 1.500" ring fit perfectly without any modifications needed.

Penelope ★★★★★

I was worried about the decibel reduction being a gamble, but this insert kit toned down my RS-4 just enough for trail riding without losing that deep rumble. The 1.500" ring slipped right in and hasn't loosened up after a few rides.

Thomas V. ★★★★★

The ring fit perfectly on my RS-4 and dropped the noise just enough for my neighborhood. Installation was straightforward, maybe ten minutes with basic tools. Exactly what I needed without swapping the whole muffler.

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