- If performance is your priority, the Factory 4.1 is the exhaust for you
- Used by Factory teams such as KTM, Epic Can-Am and Rath Racing
- Accepts optional quiet inserts and spark arrestors
- For use with FMF Powerbomb, FMF Megabomb, or stock header
- FITS - 2004-2009, 2012-2015 Yamaha YFZ 450 4x2