Free Shipping on Orders Over $200.00




Search by Bike:

The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology™ both internally and externally. In addition, we achieve a shorter overall length that is less susceptible to crash damage and complementary to our 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 our exacting specifications and is manufactured 100% at our Southern California factory.

-Available in Blue Anodized Titanium Muffler with Carbon End Cap 

-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 specifically to our standards.

-See Features Tab -> Fitment for header compatibility 

Notice: Closed Course Use Only
Item ID: 045668
Type: Slip-On
Configuration: Single
Const: Titanium
Finish: Blue Anodized
Midpipe: Stainless Steel
Endcap: Carbon
Spark Arrestor: Screen Insert (included)
Carb Warning: no
Quiet Insert: 94dB Insert (included)

Make Model Year Make Model Year
BETA 350RR 20-21 BETA 390RR 20-21
BETA 390RR 20-21
BETA 430RR 20-21 BETA 480RR 20-21
BETA 480RR 20-21
    BETA 350/390/430/480RR'20-21 HEX Q4 S/A MFLR   Item ID: 045667 - Q4 HEX S/A
    For: BETA 350RR 2020


    BETA 350/390/430/480RR'20-21 P-CORE 4 HEX MFLR   Item ID: 045666 - Powercore 4 HEX
    For: BETA 350RR 2020


    Newsletter Sign-Up!

    Sign up to receive the latest news and deals from FMF Racing.