Rebuffini's Newton air cleaners are CNC machined from solid billet aluminum using the latest three dimension technology. The unique looks of this air cleaner has already attracted many professional custom bike builders to use them on prize winning bikes. Performance in every sense as these air cleaners allow your engine to breathe freely and enhance the looks of your ride. 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.