I have been considering upgrading my C207 from Audio50 to Comand NTG4. Several sources on the internet strongly advices also to install the ventilation duct and fan. This kit is not that expenceive. No problem. The installation instruction is giving me second thaughts however as the entire dash board including steering wheel will have to be removed in order to fit the duct and fan. Not installing ventillation is not an option, but I am wondering if there might be an easier way to obtain suficcient air flow, ie. using a flexible tube and place the fan somewhere else. Any ideas? Has anyone found a simpler solution?