The Tesla S has a bioweapon defense mode. I wouldn't mind updating the filter to a HEPA at least. Has anyone found one?
"Bio-Weapon Defense Mode
Model S now features a Medical grade HEPA air filtration system, which removes at least 99.97% of particulate exhaust pollution and effectively all allergens, bacteria and other contaminants from cabin air. The bioweapon defense mode creates positive pressure inside the cabin to protect occupants"