Hofmann Designs Signature Series Air Cleaner Kit Hoffman Designs brings you a specialized air cleaner kit crafted for Milwaukee-Eight engines. Meticulously designed, it strikes the perfect balance between a sleek, compact package and optimal performance, boasting a full-size K&N filter. Features: Designed exclusively for the '23.5 121 Vvt, '24 117 & '24 121 engines This design allows you to keep your leg tucked in substantially more than the factory air box Manufactured in-house from 6061 billet aluminum Your choice of Standard 5 Spoke or Directional 5 Spoke 100 bolt on design Includes all necessary hardware, fittings, and gaskets Includes K&N Hi flow air filter Made in the USA