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