FMF Factory 4.1 Muffler KX250F/X 2021-2024 042396 1821-2036 Screen Insert for 4-Stroke Exhaust — Noise Reducer/Spark Arrestor creating a leak-proof sealThe filter

creating a leak-proof sealThe filter media traps dirt or debris that can enter into your fuel system when refueling

Kit Springs provide improved feel and a stronger spring rate for better engagement

Seam-free collar edge

engineered bi-density front flexion control is strategically positioned over the mesh area

FMF Factory 4.1 Muffler KX250F/X 2021-2024 042396 1821-2036 Screen Insert for 4-Stroke Exhaust — Noise Reducer/Spark Arrestor creating a leak-proof sealThe filterRCT (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