a box like housing having {HEAD ~ a first inlet} for {TAIL ~ exhaust gas} formed in a first wall thereof, a first outlet for the exhaust gas formed in a second wall thereof and a second outlet for the exhaust gas formed in a third wall thereof, said second and third walls being arranged at right angles with each other 
for
a box like housing having { HEAD ~ a first inlet } for { TAIL ~ exhaust gas } formed in a first wall thereof , a first outlet for the exhaust gas formed in a second wall thereof and a second outlet for the exhaust gas formed in a third wall thereof , said second and third walls being arranged at right angles with each other
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH