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FMF Factory 4.1 — RCT Titanium Anodized Full System — Yamaha WR450F (2024-2026), Yamaha

Part # 044478
Item #357806
Discontinued. The manufacturer has retired this part. We're listing whatever's still in stock at our warehouse — when it sells out, it's gone.
Fits 3 motorcycles
  • Yamaha
    • WR450F · 2024–2026
    • YZ450F · 2023–2025
    • YZ450FX · 2024–2026
$1,374.99 $1,237.49 Save $137.50
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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
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WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov
FMF Factory 4.1 RCT Titanium Anodized Full System — Yamaha WR450F (2024-2026), Yamaha YZ450F (2023-2025) + 1 more, 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:

  • Yamaha WR450F (2024-2026)
  • Yamaha YZ450F (2023-2025)
  • Yamaha YZ450FX (2024-2026)

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.

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