{HEAD ~ Exhaust} flows from {TAIL ~ the turbocharger} 18 through the DOC 32 and the PF 34 
flows from
{ HEAD ~ Exhaust } flows from { TAIL ~ the turbocharger } 18 through the DOC 32 and the PF 34
HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH