I need to fit a second battery to run a heater in my 300tdi auto.....so as it has edc and an airflow meter was wondering if it would get enough air from a 200tdi airbox.I have a southdown snorkle fitted ,hence no room due to the front air intake into filter box to fit a battery.it has no abs so that wouldnt be in the way. Has anyone successfully done this? ,as dont want to buy a filterbox and piping if it wont fit. Thanks, and yes i have done a search but lots of discussion but no definitive answer or pics. Cheers,S.