Yoshimura R&D of America, Inc.

SOUND INSERT KIT 94db RS-4 Muffler, 1.500" (INS-14-K)

SOUND INSERT KIT 94db RS-4 Muffler, 1.500" (INS-14-K) - Main image
$30.71 $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)

Richard K. ★★★★★

This kit let me dial in the noise level just right for the trails, and the fit on the muffler was perfect with no extra modifications needed. The decibel drop was noticeable without killing all the exhaust tone.

Evelyn B. ★★★★★

Installed the insert kit on the RS-4 and the 94db rating is spot on for my setup, way quieter than the stock open baffle. The 1.5" size fit the muffler perfectly without any extra shims. Took maybe twenty minutes to swap out, solid little kit for the price.

Ellie ★★★★★

I’d been on the fence about trying this insert kit, but it quickly solved the drone problem I was having with my RS-4 setup. At 1.500", the fit was spot-on with no extra hardware needed. The overall tone is now exactly where my local range requires it without killing performance.

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