Product image 1CRF450R/RX 17-20 / CRF450R-S 2022 RS-9T Stainless Full Exhaust, w/ Stainless Mufflers
Product image 2CRF450R/RX 17-20 / CRF450R-S 2022 RS-9T Stainless Full Exhaust, w/ Stainless Mufflers
Product image 3CRF450R/RX 17-20 / CRF450R-S 2022 RS-9T Stainless Full Exhaust, w/ Stainless Mufflers
Product image 4CRF450R/RX 17-20 / CRF450R-S 2022 RS-9T Stainless Full Exhaust, w/ Stainless Mufflers
Product image 5CRF450R/RX 17-20 / CRF450R-S 2022 RS-9T Stainless Full Exhaust, w/ Stainless Mufflers
Product image 6https://www.youtube.com/embed/_py9y5Z697E?rel=0
Product image 7https://www.youtube.com/embed/k48F5c1ZXqw?rel=0

*Product may vary by application

CRF450R/RX 17-20 / CRF450R-S 2022 RS-9T Stainless Full Exhaust, w/ Stainless Mufflers

SKU: 225840R520

Sound Insert/Spark Arrester Options

Regular price $1,039.00


Signature Series Exhaust System


over $100


Repair Services

Same day shipping on In Stock items placed Mon-Fri by 1:00 pm PST. Please contact sales@yoshimura-rd.com for ETA's on Reserve Now / Pre-Order Items.

2 left in stock


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

The CRF450R's new engine and muffler configuration gave us the opportunity to create an entirely new system built specifically for the new CRF450 machines. Introducing our all-new Signature Series RS-9T tapered dual muffler exhaust system for the all new CRF450R.

Yoshimura has been working tirelessly on development with American Honda HRC's engineers to achieve maximum performance and mass centralization, to optimize rider usability. Yoshimura achieved all this by moving the new RS-9T mufflers forward in order to tuck in under the side number plates. Working with HRC race engineers and the all-new 449cc Unicam engine and its unique downdraft fuel injection system, Yoshimura was able to deliver an exhaust that provides more tractable power and improved torque.

    Some features on the new RS-9T dual tapered muffler CRF450R/RX system include:
  • Dyno and track tested by Honda R&D in Japan, American Honda MX Team, and HRC All Japan MX Racing Team
  • 3-stage header provides broader overall range of power and throttle response
  • New tail pipe divider creates smoother exhaust flow and better velocity to the right and left tail pipe
  • New compact forward positioned RS-9T dual muffler design provides lower center of gravity for better mass centralization
  • Larger RS-9T core creates improved throttle response, and power in mid and top end
  • New RS-9T mufflers have more volume than stock to provide a decrease in overall dB noise level
  • Works with or without Honda's new optional electric start system
  • Stainless Steel Header and Tail-pipe
Sound Insert/Spark Arrester Options                 
Sound Level
Volume Insert Spark Arrestor Included


    SA-14-K No

    SA-15-K No 


    . . . . .

    This product was designed to fit on a standard equipped motorcycle, as delivered from the factory. OE and aftermarket accessories not found on a bike as delivered from the factory may not be compatible with this product.

    Attention international customers: This product was designed and tested to be compatible with vehicles in the U.S. marketplace only. Compatibility, including fitment and performance, may vary by marketplace.

    Signature Series Exhaust System

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    Introducing Signature Series by Yoshimura - an offering of exhaust systems that a dealer can install with confidence. Our Signature Series lineup is the answer for today's dealer who is faced with a challenging marketplace. The applications for the Signature Series line cover the entire powersports spectrum, including many of our off-road applications. Every one of our Championship Winning Motocross exhaust systems and nearly all of our ATV/Side-by-Side applications are members of the Signature Series Family. All Signature Series components are tested, documented, and marked as required by federal and state regulations.

    Vehicle Fitment

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  1. Honda CRF450R 2017
  2. Honda CRF450R 2018
  3. Honda CRF450R 2019
  4. Honda CRF450R 2020
  5. Honda CRF450R S 2022
  6. Honda CRF450RX 2017
  7. Honda CRF450RX 2018
  8. Honda CRF450RX 2019
  9. Honda CRF450RX 2020

  10. Customer Reviews

    Based on 1 review
    Jeff Walker
    Only Trust the Best!

    For the last 10 years, Yoshimura is the only brand that I've trusted to provide me with the best performance in my racing endeavors. As an amateur I was drawn in by how awesome the RS-9T system looks and sounds, and as a professional I've discovered the performance benefits it provides over anything else on the market. After long days on the dyno with several major exhaust manufacturers, we found that the Yoshimura exhaust not only delivers the most power, but also provides the best power delivery. The only thing better than a fresh Yoshi exhaust system is the people who work at the company! Great looks, killer sounds, impressive performance, and awesome people are what keeps bringing me back to this company and is exactly why you should snag a Yoshi system for your bike!

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    Race series product restriction and affirmation


    The RACE SERIES product you are purchasing removes, renders inoperative, or bypasses required elements of the emission control systems of EPA, certified motorcycles of motorcyle engines and may only be installed on motorcycles that are restricted to closed course competition. Installation of this product on a motorcyle that is ridden on a public street, highway, or public lands violates the tampering and defeat device provisions of the Clean Air Act & 203(a)(3)(A) and/or & 203(a)(3)(B) and may subject you to a civil penalty of up to $37,000.

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    Race Information

    Rider/Purchaser Information


    By clicking below, I affirm:
    1. that i have read the above warning;
    2. that any information I have entered is accurate; and
    3. that any motorcycle on which I install the RACE SERIES product will be restricted to closed course competition and will not be ridden on any public street, highway or public lands.