Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 7 - Jul 12
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
FMF Factory 4.1 RCT Muffler - Aluminum KX450F 2009-2011 042291 1821-1392The Factory 4. 1 RCT incorporates FMF's Resonance Chamber Technology both internally and externally In addition, FMF achieves a shorter overall length that is less susceptible to crash damage and complementary to their Factory Forward Engineering moving the muffler closer to the motor to centralize mass The Factory 4. 1 RCT is constructed from only aerospace grade materials that meet their exacting specifications and is manufactured 100% at their
- The Factory 4.1 RCT incorporates FMF's Resonance Chamber Technology™ both internally and externally
- In addition, FMF achieves a shorter overall length that is less susceptible to crash damage and complementary to their Factory Forward Engineering - moving the muffler closer to the motor to centralize mass
- The Factory 4.1 RCT is constructed from only aerospace grade materials that meet their exacting specifications and is manufactured 100% at their Southern California factory
- Massive Power gains throughout the RPM range.
- Huge weight savings
- RTS (Rapid Tuning System)
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
4.6 ★★★★★
Based on 267 reviews
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Product Reviews
★★★★★ 5
Great buy
Warm and fun
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 12, 2026
★★★★★ 5
Great quality
Size: 7-8 Toddler, Color: Moo-moo Cow
These are so cute and comfortable. My 3 yo can put them on himself and it is so cute that they light up. Fit as expected and are great quality. Even the dog hasn’t been able to tear them apart. Would buy more styles!
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Reviewed in the United States on January 27, 2025
★★★★★ 5
Great brand
Size: 7-8 Toddler, Color: Moo-moo Cow
I usually order from their web site but they were out of stock so I decided to check Amazon and there they were. They are cute. The baby keeps them on his feet. They look warm because they are well cushioned. The quality is good and it makes a great gift because they light up.
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Reviewed in the United States on January 2, 2025
★★★★★ 5
Grandson LOVES them!
Purchased for my grandson. He LOVES them and especially because they light up! Very comfy..
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Reviewed in the United States on February 6, 2025
★★★★★ 5
They make her happy
She hasn’t stopped since we put these on!!
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Reviewed in the United States on March 23, 2025
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