Yoshimura R&D of America, Inc.

SOUND INSERT KIT 99db RS-4 Muffler, 1.625" (INS-10-K)

SOUND INSERT KIT 99db RS-4 Muffler, 1.625" (INS-10-K) - Main image
$27.44 $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)

Abigail T. ★★★★★

The lower decibel level is perfect for my neighborhood, and the fit on the 1.625" pipe was spot-on with the included hardware. Cured the excessive noise without killing all the power.

Miles ★★★★★

Installed this insert kit on my RS-4 and the sound dropped just enough to pass our local track's noise limit without losing that deep tone. The 1.625" fit perfectly with no extra shims needed.

Daniel M. ★★★★★

I needed to quiet down my exhaust on a track day and this insert dropped the decibels just enough to pass sound check without killing all the power. The machined fit into the 1.625" outlet was precise, no filing or hammering required. Installation took about 20 minutes and the difference in noise le

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