The best filter in the world can't do its job if there are leaks in the seal of the airbox. That's why Twin Air provides a complete line of products to ensure a leak-proof, fool-proof fit. Twin Air's Power Flow kit comes with a rigid, lightweight, billet aluminium cage that provides a tight seal to the airbox and replaces your flimsy plastic stock cage. Includes a Fire-resistant Twin Air Filter. POWER FLOW KIT 154224C (INC AIR FILTER, ALIMINIUM CAGE) GAS GAS MC250F 24-25 MC350F 24-25 MC450F 24-25 MC250F FACTORY EDITION 23-25 MC450F FACTORY EDITION 23-25 GAS GAS ENDURO EC250F 24-25 EC350F 24-25 EC450F 24-25 EC500F 24-25 GAS GAS XC EX250F 24-25 EX350F 24-25 EX450F 24-25 KTM MX 250 SX-F 23-25 350 SX-F 23-25 450 SX-F 23-25 250 SX-F FACTORY EDITION 22-25 450 SX-F FACTORY EDITION 22-25 KTM ENDURO 250 EXC-F 24-25 350 EXC-F 24-25 450 EXC-F 24-25 500 EXC-F 24-25 HUSQVARNA MX FC 250 23-25 FC 350 23-25 FC 450 23-25 FC 250 FACTORY EDITION 22-25 FC 450 FACTORY EDITION 22-25 HUSQVARNA ENDURO FE 250 24-25 FE 350 24-25 FE 450 24-25 FE 501 24-25 HUSQVARNA XC FX 350 23-25 FX 450 23-25