This recirculating catch can kit has been designed for use with the IE billet valve cover (IE part number: IEBAVC5) as a simple install solution for your billet valve cover and catch can.
IE billet valve cover sold separately.
Most commonly used to eliminate battery drain issues in Pre-2009 model Volkswagen cars when upgrading the radio to a later model such as the RNS510, RCD510 ,RCD330, RCD340 etc.
The Canbus Gateway Module, will require coding using software such as VCDS or OBDII.
Installation instructions: https://www.my-gti.com/2296/can-bus-gateway-removing-installing-and-upgrading-volkswagen-golf