FMF Racing® 045558 - Factory 4.1 RCT™ Stainless Steel Slip-On Muffler

4 reviews|Item # mpn4565169004
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    Notes:
    • Remember to check your local or state laws regarding vehicle noise restrictions
    • This is a Race Only product that is to be used solely for competition. It cannot be used on vehicles that are operated on public streets, roads or highways. Its use is limited to closed-course and open-course racing that is formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, could be in violation of local, state and federal laws. Shipping Restriction: CA, NY, ME
    Authorized Dealer
    $494.99
    In Stock (4) - Ships Tomorrow 06.16.26
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    Vehicle Fitment

    Husqvarna
    KTM

    Specifications

    Material
    Stainless Steel
    End Cap Material
    Carbon Fiber
    End Cap Finish
    Carbon Fiber
    Exhaust Type
    Slip-On Muffler

    Features

    • All new incorporating the latest in Resonance Chamber Technology
    • Patented core shape lowers sound level while maintaining maximum power output
    • Patented canister shape increases internal volume for more sound absorbing material
    • Patented chamber design to enhance and refine exhaust pressure
    • Factory Forward Engineering centralizes mass and is less prone to crash damage
    • Tuned exhaust with optimized core specifications for each application
    • Innovative rear endcap for simple installation of tuning tip inserts or spark arrestor
    • Stainless Steel midpipe for strength and durability
    • Includes spark arrestor and wash plug
    • Designed for your exhaust system needs
    • Will deliver unparalleled performance
    • Exquisite workmanship and great longevity

    Product Details

    Factory 4.1 RCT™ Stainless Steel Slip-On Muffler (045558) by FMF Racing®. The Factory 4.1 RCT incorporates the latest in FMF 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 the 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 the exacting specifications and is manufactured 100% at the Southern California factory. Massive power gains throughout the RPM range. Huge weight savings. New RTS (Rapid Tuning System). FMF uses the highest quality proprietary blend of alloy grade titanium made especially to the standards.

    Installation

    FMF Racing® - Factory 4.1 RCT™ Stainless Steel Slip-On Muffler Installation guide
    {Detailed description 4}
    FMF Racing® - Factory 4.1 RCT™ Stainless Steel Slip-On Muffler Installation guideMade In USAFMF Racing Authorized DealerFAQCatalogAbout us
    Brand:
    FMF Racing
    Part Number:
    045558

    Reviews

    (4)
    Only authorized customers can leave a review on our website. We would love to know what you like or dislike about the product. Share your opinion on product quality, appearance, installation, and other characteristics.
    /5
    1-4 of 4 Reviews
    5 of 5
    High-Performance Exhaust
    This exhaust is shorter and lighter than my original muffler, and sits closer to the engine. My YFZ450R breathes easier with this exhaust, resulting in a significant power boost, especially at higher RPMs. And yeah, the carbon-fiber exhaust cap looks really cool.
    FMF Racing® - Factory 4.1 RCT™ Slip-On Muffler
    Posted by Kathleen (Washington Dc., DC) / May 06, 20192011 Yamaha YFZ450R
    5 of 5
    Moderate Sound and Performance
    Easy-to-install product with a bit more powerful sound at low RPMs. Expected it to sound more aggressive at higher RPMs. Pleased with its finish and look.
    Posted by Wali (Warr Acres, OK) / April 06, 20192018 Suzuki RMZ450
    5 of 5
    Sounds Perfect! Five Stars
    I’m very pleased with the results. Installed this muffler without any problems. It fits exactly as described and provides a slight increase in top-end speed. And yes, it sounds really nice. Loud but not annoying. Just what I wanted!
    FMF Racing® - Powercore 4™ Slip-On Muffler
    Posted by James (Fort Worth, TX) / June 04, 20202018 Yamaha YFZ450R
    5 of 5
    Nice Product, Works As Described
    What a nice exhaust! Very easy to install. Everybody can do it in less than 15 minutes. Looks stunning and gives a slight increase in performance. The sound is miraculous. It makes heads turn when I pass by.
    FMF Racing® - Factory 4.1 SL™ 4-Stroke Silencer
    Posted by Barbara (Minotola, NJ) / March 03, 20202005 Yamaha YFZ450

    Questions and Answers

    (0)
    If you have any questions about this product, please don't hesitate to ask us. We will be happy to help you!