Hot exhaust gas from {HEAD ~ the by pass port} which is directed at {TAIL ~ the burn off converter} for converter light off flows primarily through the central portion of the converter, with the result that the converter is unevenly heated 
is directed at
Hot exhaust gas from { HEAD ~ the by pass port } which is directed at { TAIL ~ the burn off converter } for converter light off flows primarily through the central portion of the converter , with the result that the converter is unevenly heated
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH