Yoshimura R&D of America, Inc.

SOUND INSERT KIT RS-4 Muffler (1.375 in dia.)

SOUND INSERT KIT RS-4 Muffler (1.375 in dia.) - Main image
$29.89 $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.

Before you pay

Check the method and total at checkout.

When it ships

Allow for processing time as well as the journey to you.

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

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

View policy
If you need a refund

Keep your order number and contact the store to start.

Please contact us for the refund processing timeframe before returning an item.

View policy
Delivery costs

Review the cost for your destination and chosen service.

Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

View policy
Returning an item

Check the return conditions before sending anything back.

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

View policy

Customer Reviews (4.6 / 5 · 5 reviews)

Edward ★★★★★

Dropped the decibel level noticeably on my RS-4 without cutting off the exhaust note entirely—exactly the middle ground I was after. The non-spark-arrested design means I don't have to worry about clogging on long rides, and the 1.375-inch diameter slid right in with zero fuss.

Chloe F. ★★★★★

Fits the RS-4 muffler like it was meant to be there, and the non-spark arrested design is exactly what I needed for the track. Took maybe ten minutes to swap out and the sound difference is noticeable right away.

George ★★★★★

Wasn't sure this 1.375 inch insert would fit my setup, but it dropped right in and made the exhaust note much more manageable without killing all the bark. The non-spark arrested design is exactly what I needed for off-road only.

Related Products