Proper air filtration is critical, and so is the breathing requirement of a high-output engine. Minimal hood clearance with the use of free-breathing intake manifolds will often create air cleaner interference issues. In many cases, there is very little room. K&N Engineering offers solutions, with air cleaners that have become the standard of the industry. Special 1” drop-base air cleaners allow the use of a full 3” tall air cleaner element and a very important 1” spacer plate under the carburetor. K&N air cleaner elements are reusable, and when washed and maintained correctly they will last forever.