Motorcycle Speed Up Filter Sponge Element Fit For CFMOTO 400NK GT MT 650 Engine Replacement Parts Fit For 400NK 400GT 650 MT refit models; box inner frame contour for direct replacement slip in installation without or extra adapters; compatible with airbox mounting structure for quick swap multi layer porous sponge design improves flow; traps road dust sand fine debris to stabilize fuel ratio throttle response elastic oil absorbing foam with anti treatment; engine long distance riding vibration without cracking or deformation die cut forming with vehicle exclusive outline; tight gap free sealing inside airbox; consistent dimensional standard with OEM filter element