Shipping Estimate
USA
- USA
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- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 9 - Jul 14
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Description
FMF Racing Kawasaki KX450F 19-23 / KX450X 21 SS Aluminum Factory 4.1 RCT SO Muffler w/ R. Carbon CapExperience high performance sound and durability with the FMF Racing Factory 4. 1 RCT Muffler designed for Kawasaki KX450F models from 2019 to 2023 and the KX450X from 2021. Crafted with stainless steel and an aluminum body, this muffler features a beautiful racing carbon fiber cap that enhances both aesthetics and function. It delivers a powerful exhaust tone while optimizing your bike's performance for a superior riding experience. The Factory 4. 1
Experience high-performance sound and durability with the FMF Racing Factory 4.1 RCT Muffler designed for Kawasaki KX450F models from 2019 to 2023 and the KX450X from 2021. Crafted with stainless steel and an aluminum body, this muffler features a beautiful racing carbon fiber cap that enhances both aesthetics and function. It delivers a powerful exhaust tone while optimizing your bike's performance for a superior riding experience.The Factory 4.1 RCT SO Muffler is engineered to provide excellent power gains and reduce weight compared to stock options. FMF's signature design ensures long-lasting quality and reliability on the toughest trails, making it a favorite among motocross enthusiasts and racers alike. Easy to install, it fits perfectly on your Kawasaki, giving you that aggressive edge and unmistakable style on the track or trail.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 2169 reviews
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Product Reviews
★★★★★ 5
Great
Works great, as long as you don’t lean of one edge too much
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Reviewed in the United States on May 18, 2026
★★★★★ 5
Good roller
Sturdy and strong. Rolls smooth. I used it to put down sound deadener in my classic car. Sometimes you think cheap is cheap but this is a good one.
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Reviewed in the United States on April 12, 2026
★★★★★ 5
Great value great quality.
Very good quality made and very good price.
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Makes For Quiet Rides
Model: 10 SqFt(0.95 SqM)
Comparable quality and performance to name brand competitor. It sticks on strong, easy to apply, and does make a difference in sound reduction. Turn your hollow shell sounding vehicle panels into solid sounding walls.
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Reviewed in the United States on March 15, 2026
★★★★★ 5
Must for subwoofers. True 2mm spec. High quality.
Model: 36 SqFt(3.4 SqM), Model: 36 SqFt(3.4 SqM)
Let me start of by saying WOW! This made a huge difference in the SQ of my L7S pushing 930w rms. Before I had major rattles in my 2020 Honda Civic SI. Taking the time to do this to my trunk and Lid made me realize just how loud my subwoofer actually is. It literally eliminated the rattles throughout my whole car. I still plan on doing this to my doors and rear deck but once I upgrade the speakers. I still have half of the box just doing the trunk and lid so 1 box of 36sf will be enough for most of the areas that need to get done. You may need a little more overall. This is true 2mm spec. Very sticky and easy to apply. It just take time to finish the work correctly and roll it down. It is not as heavy as I thought it was going to be. The size of the sheets are perfect for what you need to do. The value is on point for the quality. It does not rip very easily but you can cut it to size without any problems. Again, This is a must buy for anyone who is pushing 1000w rms or more.
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Reviewed in the United States on November 29, 2025