FMF Factory 4.1 RCT Exhaust - Aluminum CRF450R/RX 2021- 2025 041604 1820-1993 Competition Handlebar — ATV Race/Competition Stock Exhaust System = 19

Stock Exhaust System = 19

but only for 8-inches

By flashing your ECU you are able to tune your bike without interfering with critical correction factors resulting in smoother power gains than ever before possible

5" at the rear Fits models with mid controls only

Ventilation system on the side in order to improve the airflow and breathability

FMF Factory 4.1 RCT Exhaust - Aluminum CRF450R/RX 2021- 2025 041604 1820-1993 Competition Handlebar — ATV Race/Competition Stock Exhaust System = 19RCT (Resonance Chamber Technology) features a patented core shape that lowers decibels while maintaining maximum power output Internal ducts in the chambers of the RCT system increase internal volume for improved exhaust flow, resulting in power gains throughout the entire range of power FMF's Factory Forward Engineering centralizes mass and is less prone to crash damage Innovative rear end cap features simple installation of tuning tip inserts or