K N Typhoon Kit Suitable For Subaru Legacy Gt H4 2 5l 2005 2009 Flat Black 69 8003tfkK&N Typhoon kit K&N Typhoon kit. A look under the hood of modern cars makes it clear that the air intake is limited by unnecessary bends and kinks. Air flows the best in a straight line, and is most preferable not slowed down by the filter material. With a K&N air filter you optimize the air supply to your engine. This ensures better performance and a better engine sound. Because of this feature many people call it a power filter. This type of K&N air