Fmf Factory 4.1 Slip-on Muffler
Fmf Factory 4.1 Slip-on Muffler
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About this product
About this product
Unleash superior power and performance with the FMF Factory 4.1 Slip-On Muffler. This lightweight muffler is engineered to deliver improved horsepower throughout the entire RPM range, giving you the competitive edge you need. Built with premium American materials and FMF's exclusive Chamber Core technology, the Factory 4.1 is designed for enthusiasts and professionals seeking the best in exhaust technology.
Description
The FMF Factory 4.1 Slip-On Muffler offers a significant upgrade in both power and handling. Its innovative Factory Forward Engineering centralizes mass, enhancing your motorcycle's agility and responsiveness. The muffler's Chamber Core technology optimizes exhaust flow, resulting in increased horsepower and torque. Crafted from high-quality aluminum and stainless steel, this slip-on muffler not only boosts performance but also provides exceptional durability. Its modular design allows for customization with performance tuning inserts and a spark arrestor module, making it adaptable to various riding conditions and preferences. Upgrade your ride with the FMF Factory 4.1 and experience the difference.
Features & highlights
- Experience enhanced horsepower and torque throughout the RPM range.
- Benefit from improved handling due to Factory Forward Engineering, which centralizes mass.
- Enjoy the lightweight design, contributing to overall performance gains.
- Customize your exhaust with performance tuning inserts and spark arrestor modules.
- Crafted from premium quality American materials for lasting durability.
- Features FMF's exclusive Chamber Core technology for optimized exhaust flow.
- Meets AMA sound requirements on most models for responsible riding.
Technical specifications
- Brand: FMF
- Product Name: Muffler
- Type: Slip-On
- Material: Aluminum
- End Cap Material: Stainless Steel
Important to know
Please note that this muffler will not pass the 2025 FIM sound regulation. Inserts are available for models that do not meet AMA sound requirements.
Shipping & Return
Shipping & Return
Free shipping to GLS parcel shop parcel box for purchases over DKK 1,000.
GLS home delivery costs DKK 59.
We do our best to ship your order as quickly as possible. All orders are generally packed within 24 hours on weekdays.
There is a 14-day return policy. Read more
Parts Denmark Info
Parts Denmark Info
Parts Denmark is a new webshop based in Denmark. We have a physical location you can visit (No showroom yet), and we have both email and phone support in our opening hours.
Our company info is:
Parts Denmark ApS
VAT: DK45974758
Dam Holme 11
3660 Stenløse, Denmark
hello@partsdenmark.com
+45 222 333 29
Best regards,
William Svendsen & Martin Høyer (Owners)
Specifications
FMF
041592
Muffler
Stainless Steel
Aluminum
Slip-On
Each
Reviews


Who is behind Parts Denmark
Martin and William are the duo behind Parts Denmark — an unlikely but awesome combo of a tech-savvy young IT wizard and a seasoned motorcycle guru who’s seen (and fixed) it all. Together, we’ve built a team with big ambitions, plenty of passion, and a shared mission to create great things — side-by-side with you.
Based in Denmark
Fast customer support
Over 100.000 Products
2-Year Full Warranty
Your peace of mind is our priority. Every product in our shop comes with a comprehensive 2-year warranty, so you can hit the road with full confidence.
Support in Danish, Swedish, German & English
Whether you are upgrading your exhaust or choosing a new helmet, our team of seasoned riders is ready to provide professional guidance for your specific bike.
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Shop your favorite gear without worrying about extra costs. We offer free shipping on all orders over 200€ (EU), ensuring your parts reach you safely and affordably.
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As a certified Parts Europe supplier, we guarantee 100% authentic, high-quality motorcycle parts and accessories directly from the world's leading manufacturers.

