The PF 34 receives exhaust from the DOC 32 and filters {HEAD ~ any soot particulates} present in {TAIL ~ the exhaust} 
present in
The PF 34 receives exhaust from the DOC 32 and filters { HEAD ~ any soot particulates } present in { TAIL ~ the exhaust }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL