Attention: You are purchasing closed course competition Product(s)

I acknowledge that the product(s) being purchased () was/were designed and intended for closed course competition use only. The product(s) is/are neither designed nor intended for use on public roads or land and is against Federal and State regulations to do so. By proceeding with this purchase, I , agree to only use the product(s) for closed course competition.

If an ECU tune was purchased, please send your unmodified and undamaged OEM ECU to TST Industries, located at 623 Pleasant St, Lake Helen, FL 32744.

* All fields are required Close Aknowledgement
x

FREE SHIPPING OPTION FOR DOMESTIC ORDERS:

U.S. customers are offered a free shipping option for orders with a discounted subtotal greater than $250.00 (before taxes applied). The order's shipment destination must reside within the United States of America. The free shipping options still utilize our standard postage providers and 3rd party shipping companies. Does not apply to large items such as exhausts, stands, and bodywork shipping. All terms and conditions that apply to normal orders will continue to apply to orders with a free shipping option.

NO RESTOCKING FEES:

An item returned within 30 days of purchase, that includes an accurate RMA#, in a perfectly new, unopened condition, and that complies with our other return policies, will not be charged a restocking fee.

MOST QUESTIONS ABOUT THIS PRODUCT CAN BE ANSWERED ON THIS PAGE.

The most common product related questions are answered in the tabs section on this page. Be sure to carefully read through the "Product Details", "In the Box", and "FAQs" tabs. In addition, a lot of our products have comprehensive videos demonstrating installations and product features. You can find those videos in the "Videos" tab.

Note: Some product pages may not have all the tabs mentioned above. Please read through all the available tabs to find the answers to your questions. If you still need assistance, please use the "ASK A QUESTION ABOUT THIS PRODUCT" button below the tabs section.
NO ADDITIONAL COST: You pay at the time of checkout and never have to worry again.
COVERAGE: Our Limited Extended Warranty starts on the date of purchase. It covers all manufacturer defects for our TST Exclusive products. (Products manufactured by us with the exception of our WORX products)
EXPERT HELP: As always our team is here to help. If you’re unsure about this warranty or if your product is eligible, feel free to reach out to us and we can help answer any questions you may have!
PRODUCT ELIGIBILITY: TST will offer our Limited Extended Warranty on all products manufactured by TST Industries.
EASY CLAIMS PROCESS: Simply click the “Contact Us” page and fill out the “Returns Form” to begin the warranty process. Once our team receives your email and initiates the RMA, you can send your product back to us and we will repair/replace the product at no cost as long as a manufacturer defect is found. What qualifies as a manufacturer defect? Check out our Terms and Conditions for some examples!

Yoshimura Race RS-4 Stainless Slip-On Exhaust for the Honda CRF300L / Rally 2021+

  • Yoshimura Race RS-4 Stainless Slip-On Exhaust for the Honda CRF300L / Rally 2021+
  • Stainless slip-on system features a stainless canister.
  • Slip-on exhaust system provides improved low-end power.
  • Upgrade your Honda CRF300L / Rally with the RS-4 Slip-On Exhaust from Yoshimura.
  • Compare the Yoshimura RS-4 Slip-On Exhaust System to the Stock System.

Yoshimura Race RS-4 Stainless Slip-On Exhaust for the Honda CRF300L / Rally 2021+

Yoshimura Race RS-4 Stainless Slip-On Exhaust for the Honda CRF300L / Rally 2021+

Shed some weight while adding extra low-end power, improved style, and that unmistakable Yoshimura sound with the new Race RS-4 Slip-On Exhaust.

Applications:
Honda CRF300L / Rally | 2021, 2022, 2023, 2024, 2025

READ BEFORE PURCHASE: This exhaust ships directly from Yoshimura. Depending on the available stock level, shipping times may vary. Before ordering, please CLICK HERE to see product availability and possible lead times. All additional items in your order will ship separately from TST within 1-3 business days.

California residents will be charged state tax.

Have a Question About This Product?
SKU YOSH-1033=1
2021 - 2024/CRF300L/Honda
Yoshimura Race RS-4 Stainless Slip-On Exhaust for the Honda CRF300L / Rally 2021+
 
Price: $599.00
Quantity

ATTENTION:

If buying this product as part of the Buy Together bundle below, define these options there.

▾

RACE EXHAUST
This exhaust was designed and intended for closed course competition use ONLY. This product is neither designed nor intended for use on public roads or land and is against Federal and State regulations to do so.

  • Product Details
  • In the Box
  • Recommended Accessories

Sound Clip

Features

  • Pentagonal-shaped sleeve
  • Front muffler cap functions as a polyresonant chamber to help reduce noise
  • Two-stage stepped baffle
  • Turn-out carbon fiber end-cap
  • Stainless steel tail-pipe
  • RS-4 Stainless Slip-on weight 7.6lbs vs Stock muffler weight 10.0lbs.
  • 14.2% more low-end max HP with equal high-end max HP compared to stock
  • Made in the USA

Description

Small displacement dual sports, like the Honda CRF300L, are an absolute blast to ride, and adding a little bit of extra power to the low end of the power delivery only adds to the fun, not to mention the added style and sound. Yoshimura's RS-4 Full System Exhaust gives 14.2% max HP to the low-end while retaining equal amounts of top-end power compared to the stock setup, all while dropping 2.4lbs of weight from your CRF. The Yoshimura RS-4 provides an unmistakable sound and eye-catching style with a stainless muffler and gloss carbon fiber end cap.

RACE EXHAUST: This exhaust system is for closed-course competition only and is not intended for public roads or land.
  • Yoshimura Race RS-4 Slip-On Exhaust with Stainless Muffler
warning

WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov

Ask a question about this product

Reviews

There have been no reviews

Add your own review

Your cart

Cart
Cart is empty
Show Items ▾

Authentication

Reviews

TST WORX Performance ECU Tune for Kawasaki Ninja 500 2024+
TST WORX Performance ECU Tune for Kawasaki Ninja 500 2024+
I use this tune on my 24 ninja 500. I've the tune on there for a season now and can say that the bikes runs with more power and runs smoothly. I run it with the full system akropravic exhaust system and love it.
Kyle McQuillan
Aug 5, 2025
Read more product reviews
Read all reviews
 
Dear Customer, TST Industries' website uses cookies to allow us to better understand how the site is being used and to enhance your shopping experience. By continuing to use this site, you consent to this policy. Click to learn more.