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  • Our price $395.00
  • MSRP Regular price $415.78
  • You save $20.78 (4%)
  • Available on

Product Overview

Overview of Yoshimura RS-4 Signature Ser8ies Slip-On Muffler - 218312D320
  • The work that went into developing the RS-4 muffler has paid big dividend in Off-Road Racing; winning multiple Supercross and Motocross titles since it's inception
  • The current generation RS-4 is based on that research and development, and the result is a unique design that provides and unrivaled combination of power and quiet exhaust tone
  • The RS-4 features a Polyresonant duplex chamber and two staged stepped baffle for increased performance while a carbon cone end cap finished off it's innovative styling
  • Pentagonal shaped sleeve
  • Front muffler cap functions as a polyresonant chamber which helps reduce noise
  • Two-staged stepped baffle
  • Carbon fiber end cap
  • Stainless steel tailpipe
  • AMA 94db sound insert installed
  • For optional spark arrestor order 43-4673

Included Items:

(1) Stainless steel exhaust clamp

(1) Tailpipe

(1) Muffler with aluminum sleeve

(1) Short exhaust spring

(1) Rubber grommet

(1) Aluminum insert

(1) 6mm-1.00 x 12mm Button head bolt

(1) 6mm External tooth lock washer

(1) Spring puller tool

(1) Red rubber exhaust plug


Brand LionParts
SKU # 196603-Yoshimura-EH-TR
Weight 10.0 lb

You love power sports. That's why we aim to deliver with the speed you crave.

Delivery times vary according to location and product purchased. The estimated delivery time provided at the checkout is an estimate only. Actual shipping time may vary. does not take responsibility for shipping delays caused by the carrier. To ensure you're receiving exactly what you want, some orders are sourced from various shipping facilities. This may cause different parts of your order to arrive separately.

Detailed shipment dates and tracking numbers will be sent to the email address provided at the time of checkout. In the event your order can't be shipped, we will contact you within two business days explaining why your shipment has been held up.

With any questions or concerns, contact us at 1-800-983-2210.

We aim to ensure you receive the best quality product, suited to your unique needs.

If a part doesn't fit or you aren't completely satisfied with your purchase, the majority of our products are eligible for a full refund within 30 days of delivery. To be eligible for a refund, products must be unopened.

Refunds can be anticipated within four weeks of depositing your package to a return shipper. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return when we receive it (3 to 5 business days) and the time it takes your bank to process our refund requests (5 to 10 business days).

If you require a refund and return, please contact us for authorization. We will notify you via email once we have received and processed the returned item. 

For any questions or concerns, call us toll-free at 1-800-983-2210. We can also be reached by email at 

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