A genuine, high-flow, K&N rechargeable air-filter element was included with the kit. Once air passes through the intercooler, it flows into the “bonnet” or air-cleaner cover. It may not look like much more than a typical air-cleaner cover from the outside, but then it’s hard to see the air-deflector located just inside the intake tube of the piece. The air deflector protects the air-filter from the high-speed incoming air (ever noticed the warning on re-useable cloth air-filters that warns the user against using compressed air to clean it?). The deflector allows air to quickly transition into the throttle body without bombarding the filter in just the intake area, spreading out the air so the entire filter is used.