The Aeroflow Performance billet universal catch can extension has been designed to work with our smaller universal catch cans (AF64-4363 or AF64-4364). This will allow you to unscrew the catch can and insert this larger extension piece to increase the capacity from 240ml to 1000ml. This is great for charger capacity engines or turbocharged applications that require the larger volume catch can to help reduce the amount of oil vapor entering the crankcase. A new long billet dipstick is included to accommodate the longer depth.