Yes ideally it does need a fire wall, but as I don't have a spare wheel well anymore, I Spoke to the Time Attack scrutineers/MSA scrutineers at Autosport and had the issue addressed. What I am going to do is make a box from alloy or thin steel to cover it which is bolted down to seal it from fumes escaping into the cabin and as the lines are in the car they have to be stainless steal and the system needs a roll over/vent valve installed. Hope this helps mate, unless you are using a ATL bag tank everything is contained inside the bag itself so will only need to make box for it to sit in and stainless steal lines in the car