When controller 62 determines that regeneration is complete , controller 62 may adjust valve 22 to reduce {HEAD ~ the amount} of {TAIL ~ exhaust} flowing through second conduit 20 
When controller 62 determines that regeneration is complete , controller 62 may adjust valve 22 to reduce { HEAD ~ the amount } of { TAIL ~ exhaust } flowing through second conduit 20
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH