FMF
Back to MX Exhaust

FMF Factory 4.1 — RCT Titanium Anodized Full System — Husqvarna FE501 (2020-2023), KTM — (see

Part # 045663
Item #357877
Fits 2 motorcycles
  • Husqvarna
    • FE501 · 2020–2023
  • KTM
    • 500 XCF-W · 2020–2023
$1,174.99 $1,057.49 Save $117.50
/
Shipping calculated at checkout.
  • In stock, ready to ship
  • Backordered, shipping soon
  • Free U.S. shipping on orders $150+ ($15 flat under)
  • Ships from one of three U.S. warehouses
  • Secure checkout
WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov
FMF Factory 4.1 RCT Titanium Anodized Full System — Husqvarna FE501 (2020-2023), KTM 500 XCF-W (2020-2023), 4-Stroke
Product Details

The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology (RCT) — both internally and externally. A patent-pending shape enhances and refines the exhaust pressure wave for optimal power output while lowering the sound level. Constructed from aerospace-grade titanium with a carbon end cap, the system is shorter, lighter, and quieter than stock.

  • FMF Resonance Chamber Technology (RCT) for power + quieter operation
  • Aerospace-grade titanium construction with carbon end cap
  • Shorter overall length — less crash-damage exposure, mass centralized
  • Rapid Tuning System (RTS) for easy insert and spark-arrestor swaps
  • Quieter than stock with huge weight savings
  • Manufactured 100% in Southern California

Fitment: 4-stroke bike specific — fits the following models:

  • Husqvarna FE501 (2020-2023)
  • KTM 500 XCF-W (2020-2023)

This is a 4-stroke exhaust. It is engineered for the 4-stroke engine architecture above and physically will not fit a 2-stroke bike. Verify your engine type before purchase.

You may also like