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6 Air cleaners aren't included in Carl's dual quad kits, but car owner Randy Dunphy opted for these Stellings and Hellings units, which Carl's sells for $175/pair. These period air cleaners came with some of Ford's original over-the-counter kits, and were also used on certain AC Cobras. The small filter elements and proximity to the Holley choke horn elicited concern about impeding airflow, thus our testing was done sans air cleaners. After all was said and done, we made one last pull with the air cleaners on, and found the Stellings and Hellings only cost 5 hp and 5 lb-ft of torque at 6,000 rpm, not too bad all in all.