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