Twin Air 152213C Power Flow Air Filter Kit Twin Air's PowerFlow kit comes with a rigid, lightweight, billet aluminum cage that provides a tight seal to the air box and replaces your flimsy plastic stock cage Power flow kit includes a pre-oiled Twin Air filter, a special aluminum cage and all necessary mounting hardware The best filter in the world can't do its job if there are leaks in the seal of the air box That's why Twin Air provides a complete line of products to ensure a leak-proof, foolproof fit