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Description
FMF Factory 4.1 RCT Muffler - Anodized Titanium KTM 350/450 SX-F 2018-2022 045629 1821-1921The 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)
| 2019-2022 | Husqvarna | FC 450 | - | - |
| 2019-2022 | Husqvarna | FX 350 | - | - |
| 2019-2022 | Husqvarna | FC 350 | - | - |
| 2019-2022 | Husqvarna | FX 450 | - | - |
| 2018-2022 | KTM | 350 SX-F | - | - |
| 2018-2022 | KTM | 450 SX-F | - | - |
| 2018-2022 | KTM | 450 XC-F | - | - |
| 2018-2022 | KTM | 350 XC-F | - | - |
| 2018-2020 | KTM | 450 SX-F FE | - | - |
Fitment Disclosure
This quick reference fitment information is provided to direct you to our catalog information and the manufacturer's information. Consult manufacturer publication(s) and/or website(s) for specific fitment and application information and other important information. This fitment information is based upon the stock version of the motorcycle or unit referenced and any accessory added or other modification could invalidate the quick reference information provided.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
4.5 ★★★★★
Based on 19 reviews
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Product Reviews
★★★★★ 5
Works well out of the box, and better with a tweak.
Color: Black, Color: Black
This is a solid, well-made WDT tool that does exactly what it’s supposed to do — and gives you room to fine-tune it to your preference.
The build quality feels good in the hand, and it works well right out of the box. A big plus is that it comes with extra needles, which makes it easy to change out bend needles or customize. I found that removing some of the needles actually improved usability for me. With all nine installed, it tended to push grounds around too aggressively.
I’m currently running just 3 needles, and that setup works much better for gently breaking up clumps and distributing grounds without pushing or spilling coffee over the basket. Once dialed in, it’s been very effective and consistent.
Overall, this is a great tool from TIVERAIN. If you like dialing in your workflow and want control over how aggressive your WDT is, this one is a great option.
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Reviewed in the United States on January 6, 2026
★★★★★ 5
Works like it should, easier to use if you keep the dosing funnel on the basket
Color: Black, Color: Black
With a weighted top and storage base, this is sturdy metal with what appear to be standard acupuncture needles. It comes with a set of spare needles in a plastic tube.
I find it much easier to use if I keep my dosing funnel on the basket, followed by a quick clearing of the funnel using a weighted espresso distribution tool with the maximum extension before popping off the funnel for my final tamp. See photo.
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Reviewed in the United States on March 11, 2026
★★★★★ 5
Simple tool that makes a difference
Color: Black
This tool really improved my espresso. It’s easy to use and helps distribute the coffee evenly, which makes the shots come out better. It feels solid and well made. Small but very useful.
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Reviewed in the United States on March 18, 2026
★★★★★ 4
It's not bad, but one minor issue FOR ME
Color: Black
There is nothing generally not to dislike about this WDT. Priced right. Good quality materials. But there are two issues that made me choose a different one, even before using this one:
The entire top and bottom are straight cylindrical pieces. Ergonomically I would have to use more, larger muscle movement from my wrist to stir the beans. Not a big deal for some, but with other similar choices at the same price, I thought I would be better off with a different model. The second issue is that then the needles are placed back in the tall "recepticle", the top piece merely sits on top and isn't secured. For some that might be good because the top can be lifted out without any opposing force. OTOH, if it tips over it might expose the needles or need two hands to get it back together. If I didn't have other choices, I'd keep this one. I knew, without even using it that it wasn't for me... but it might be for someone else. Again, the materials are quite good and you can tell by the heft of the item.
I elected to go with a similar concept, but a more contoured design with a knurled top and brushes on the inside of the recepticle to hold the needles and top in place, but also easy to extract for use. My choice over the Tiverain WDT was personal and has nothing to do with the quality of the product.
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Reviewed in the United States on February 9, 2026
★★★★★ 5
High quality and looks great
Color: Black
Works well, definitely deep enough. I like the stand- ease of lifting it off its base and then returning it without needing a second hand. Has a modern sleek look and it’s heavy in a good way. Feels like quality build.
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Reviewed in the United States on December 10, 2025