A pre drying system dries the water trap, HC trap and catalyst, {HEAD ~ eg} upon {TAIL ~ engine} switch off 
A pre drying system dries the water trap , HC trap and catalyst , { HEAD ~ eg } upon { TAIL ~ engine } switch off
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH