FMF Factory 4.1 Muffler 044211 1831-0359 909 Uppercut Slip-On Mufflers Viscoelastic knuckle guard for protection

Viscoelastic knuckle guard for protection against repeated impact

2019-2020 Honda CRF450R - - 2019-2020 Honda CRF450RX - -

Integrated high-visibility reflective details for increased visibility

Patented one-piece knee stretch accordion panels

Performs like it looks and looks like it performs

FMF Factory 4.1 Muffler 044211 1831-0359 909 Uppercut Slip-On Mufflers Viscoelastic knuckle guard for protectionIf 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