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