SOUND INSERT TUBE RS-4T Muffler Turn-Down Tip, 1.500" (INS-RS4T-B)

Name: SOUND INSERT TUBE RS-4T Muffler Turn-Down Tip, 1.500" (INS-RS4T-B)
Brand: Yoshimura R&D of America, Inc.
SKU: INS-RS4T-B
Price: 11.8 USD
Availability: InStock
Rating: 5.0 (5 reviews)

SOUND INSERT TUBE RS-4T Muffler Turn-Down Tip, 1.500" (INS-RS4T-B) - Main image

$11.8 ~~$15.95~~ In stock

Category: Replacement Service Parts

Replacement Low-Volume Insert Tube for RS-4 "Turn-down End-cap" 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

Includes:

Low-Volume Insert Tube ONLY (Dimpled Ring NOT included)

*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)

David ★★★★★ Oct 23, 2026

The turn-down tip fit perfectly on my RS-4 muffler, and installing it took less than five minutes with basic tools. The sound reduction is noticeable without killing the bike’s character—just the right balance for me. Exactly what I needed for a quieter neighborhood ride.

Matthew ★★★★★ Oct 22, 2026

Had to swap the standard tube out at the track and this drop-in insert cut the bark just enough to pass sound check. Fit perfectly into my RS-4 turn-down tip without any modification.

Sofia N. ★★★★★ Oct 21, 2026

I’ve been running this low-volume insert tube with the turn-down end cap, and the decibel reduction is exactly what I needed for my setup. The 1.5-inch tube slides in snugly and stays put even under heavy use.