FMF Factory 4.1 complete exhaust system — Yamaha YFZ 450 R 2009–2026 and others, titanium silencer, carbon, blue (4T)

The FMF Factory 4.1 is a four-stroke silencer focused on power across the range and on the lowest possible weight — it's among the lightest mufflers available. Factory Forward Engineering centralises mass and improves handling. It can be fitted with performance tuning inserts and a spark arrestor module. Fits: Yamaha YFZ 450 R (2009–2026); Yamaha YFZ 450 RSE (2009–2020); Yamaha YFZ 450 X (2010–2011); Yamaha YFZ 450 XBB (2010); Yamaha YFZ 450 XSE (2011). Specifications — muffler material: Titanium, pipe material: Stainless Steel, end cap material: Carbon Fiber, muffler finish: Anodized Blue, configuration: 1-Into-1 System, weight: 2,27 kg. Note: does not meet the 2025 FIM sound limit — intended for practice and closed courses, not for FIM-sanctioned racing. Delivery 5–8 working days. SKU: 044438.