FMF Factory 4.1 Muffler 044211 1831-0359 909 Uppercut Slip-On Mufflers 2019-2020 Honda CRF450R - -

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

Fuel Injector Proportioning

The most significant upgrades to the Tech 10 performance are unique technologies: The Frontal Flexion Control Frame

Integrated high-visibility reflective details for increased visibility

Patented one-piece knee stretch accordion panels

FMF Factory 4.1 Muffler 044211 1831-0359 909 Uppercut Slip-On Mufflers 2019-2020 Honda CRF450R - -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