Integrated Engineering SAI Filter Kit For Cold Air IntakesWHAT IS SAI? Many VW and Audi engines are equipped from the factory with a secondary air injection (SAI) pump that connects to the factory intake box. These engines require a small breather filter for this SAI line when installing one of our IE aftermarket cold air intakes. HOW DOES THE FILTER KIT WORK? This simple to install kit includes everything needed to adapt your factory SAI line to a small air filter and neatly tuck it away out of sight under