Description
NOTE: Stock photos. Muffler may come anodized blue or the new grey anodized color.
Factory 4.1 Muffler – Anodized Titanium
Superior power and performance – horsepower improved throughout the rpm range, Factory Forward Engineering centralizes mass, improves handling, Customize with performance tuning inserts and spark arrestor module
| 2007-2014 | Yamaha | WR 250 F |
| 2007-2011 | Yamaha | WR 450 F |
| 2006-2009 | Yamaha | YZ 250 F |
| 2006-2009 | Yamaha | YZ 450 F |
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