Rebuffini's Hercules air cleaners combine style and technology. They are CNC machined from solid billet aluminum using the latest three dimension technology. Air cleaner cover and the required installation kit are to be ordered separately. Installation kits include billet aluminum backing plate, mounting brackets and hardware. Kits for S&S Super E or G carburetors also includes an adjustable enrichment device to replace the S&S backing plate installed enrichment lever. Installation on European 2007 Touring models and 2007 to present Dyna and Softail models requires the separate purchase of a ZPN702022 AIS Override Module.