This K&N custom air cleaner assembly is great for racing or high - performance driving. It's designed for racers and car enthusiasts who want better engine performance. The assembly has a 5 1/8 - inch flange, an 11 - inch outer diameter, and a 3 1/4 - inch height with a vent. It works with any engine that uses a round element air cleaner housing and comes with a base, element, and top plate.