Air Filter ( T5 ) ; for 26/26g SI carburetorT5 air filter specific to the 26 26g SI carburetor. Drilled and slotted, this filter provides the best flow available from the OEM style filtration options. This filter is taller than the standard P200 filter and will require longer bolts to hold it on. Air filters work simply to make sure that the air entering the combustion chamber is clean. These filters are the metal wire gauze type and they really never wear out. Every 3000 miles or so the air