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