DON’T LET YOUR STOCK SETUP ROB YOU OF POWER AND ENGINE RELIABILITY TWIN AIR’S POWER FLOW KIT COMBINES A LARGER TWIN AIR FILTER WITH A TOUGH, SUPER LIGHTWEIGHT FLANGE THAT BOLTS TIGHTLY ONTO YOUR AIR BOX, ELIMINATING LEAKS AND PROVIDING MORE AIR FOR MORE POWER KITS INCLUDE ALUMINUM FLANGE, AIR FILTER, DUST COVER, O- RING, HOSE CLAMP AND NECESSARY MOUNTING HARDWARE FILTER IS REMOVABLE AND WASHABLE 2-STROKE KITS INCLUDE A RIGID, LIGHTWEIGHT, BILLET ALUMINUM CAGE THAT REPLACES THE FLIMSY PLASTIC STOCK CAGE AND PROVIDES A TIGHT SEAL TO THE AIR BOX 4-STROKE KITS REPLACE THE AIR-RESTRICTING STOCK BACKFIRE SCREEN KIT INCLUDES A RIGID, LIGHTWEIGHT, BILLET ALUMINUM CAGE BACKFIRE REPLACEMENT FILTER (ORDER 304056) DESIGNED WITH A SPECIAL BACKFIRE-RESISTANT LAYER OF FOAM LAMINATED TO THE INSIDE (CAGE NOT INCLUDED).