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GasGas EX 300 FunnelWeb Filter Select Year:2018-2020 EX 300 The best Beta 390 RSGasGas EX 300 FunnelWeb Filter The best GasGas EX 300 air filter is the one that provides the most filtration, extends your service intervals, and keeps your engine breathing clean. FunnelWeb ProLine Filter Highlights: Optimum airflow for increased riding time Improved engine protection Extended filter change intervals Simple to install, clean and re oil Easy fitment Like all FunnelWeb filters, the ProLine Filter features profile cut, single layer,