a box like housing having a first inlet for 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 {HEAD ~ second and third walls} being arranged at {TAIL ~ right angles} with each other 
arranged at
a box like housing having a first inlet for 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 { HEAD ~ second and third walls } being arranged at { TAIL ~ right angles } with each other
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