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  • FMF Racing Kawasaki KX450F 19-23 / KX450X 21 SS Aluminum Factory 4.1 RCT SO Muffler w/ R.Carbon Cap
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FMF Racing Kawasaki KX450F 19-23 / KX450X 21 SS Aluminum Factory 4.1 RCT SO Muffler w/ R.Carbon Cap
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FMF Racing Kawasaki KX450F 19-23 / KX450X 21 SS Aluminum Factory 4.1 RCT SO Muffler w/ R.Carbon Cap

FMF042369
Out of stock
Muffler
$599.99 $472.00
Upgrade your ride with the FMF Racing Kawasaki KX450F 19-23 / KX450X 21 SS Aluminum Factory...
$472.00
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FMF Racing Kawasaki KX450F 19-23 / KX450X 21 SS Aluminum Factory 4.1 RCT SO Muffler w/ R.Carbon Cap
Description

Upgrade your ride with the FMF Racing Kawasaki KX450F 19-23 / KX450X 21 SS Aluminum Factory 4.1 RCT SO Muffler w/ R.Carbon Cap, engineered to deliver unmatched performance and durability for serious motocross and off-road riders. This high-performance exhaust system integrates FMF’s innovative Resonance Chamber Technology™ both internally and externally, enhancing power delivery and throttle response across the entire RPM range.

With its shorter overall length, this system is less prone to crash damage and benefits from FMF’s Factory Forward Engineering, placing the muffler closer to the engine for better weight centralization and improved handling. The combination of stainless steel midpipe, lightweight aluminum canister, and carbon fiber end cap ensures a rugged yet race-ready design that shaves off critical weight while maximizing strength.

The FMF Racing Kawasaki KX450F 19-23 / KX450X 21 SS Aluminum Factory 4.1 RCT SO Muffler w/ R.Carbon Cap also includes a Rapid Tuning System (RTS) that allows for quick, tool-free tuning on the fly, ideal for adapting to changing track or trail conditions. With an included spark arrestor and 94dB quiet insert, it's also ready for a wide range of riding environments.

Features:

  • Resonance Chamber Technology™ – Enhances exhaust flow for increased power and torque throughout the RPM range.

  • Factory Forward Engineering – Positions the muffler closer to the engine, centralizing mass for improved handling and reduced crash risk.

  • Aerospace-Grade Construction – Lightweight aluminum and carbon fiber end cap reduce overall weight without compromising strength.

  • Rapid Tuning System (RTS) – Allows quick adjustments to optimize performance based on conditions.

  • Removable Spark Arrestor & Quiet Insert – Versatile setup for both closed-course racing and trail compliance.

Say goodbye to restrictive stock mufflers and unleash the full potential of your Kawasaki KX450F or KX450X. The FMF Racing Factory 4.1 RCT SO Muffler delivers track-tested power gains, sharper throttle response, and better weight distribution, giving you the edge on every ride.

Specifications:

Type Slip-On Muffler
Construction Aluminum with Carbon Fiber End Cap
Finish Natural
Midpipe Material Stainless Steel
Endcap Material Carbon Fiber
Spark Arrestor Included
Quiet Insert 94dB Insert Included
Weight 6.4 lbs
Compatibility Kawasaki KX450F (2019–2023), KX450X (2021)
Use Closed Course Only



This Part Fits:

 

Year Make Model Submodel
2019-2021 Kawasaki KX450F Base

REVIEWS

JS

Absolutely loving the power gains from this FMF muffler! Throttle response feels way snappier, and the sound is pure music without being obnoxious. Installation was a breeze, and it looks mint on my 2022 KX450F. FMF really nailed it with the design, super light and no issues so far after a few hard rides.

⭐️⭐️⭐️⭐️⭐️

Jason S.

Boise, ID

MT

I was on the fence about upgrading, but this exhaust totally transformed my KX450X. It’s lighter, louder (in a good way), and makes the bike feel way more alive. I noticed smoother power delivery right off the bat. Bonus points for the carbon cap, it looks wicked. No regrets, worth every cent!

⭐️⭐️⭐️⭐️⭐️

Marcus T.

Greenville, SC

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Effective Date: October 2024

We offer a 30-day return policy, allowing you to request a return within 30 days of receiving your item. To qualify for a return, the item must be in its original condition—unused, with tags, and in its original packaging. A receipt or proof of purchase is also required.

To initiate a return, please contact us at info@riotparts.com. Returns must be shipped to the address provided upon request. If your return is approved, we will issue a return shipping label along with detailed instructions.

Important: Returns sent without prior authorization will not be accepted.

For any return-related inquiries, please reach out to us at info@riotparts.com.

The return shipping address will be determined based on the requestor’s location to ensure the nearest return facility is used. Possible return locations include:

10880 Lear Blvd. Reno, NV 89506, United States

931 W. Bardin Rd., Suite 150–200 Arlington, TX 76017, United States

3035 Campus Dr. Hatfield, PA 19440, United States

5789 N. Graham Road, Ste 200 Whiteland, IN 46184, United States

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If more than 15 business days have passed since your return was approved and you haven’t received your refund, please contact us at info@riotparts.com.

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