The exhaust system may further have a plurality of {HEAD ~ dosers} associated with {TAIL ~ the diffuser} and configured to inject fuel into the diffuser 
associated with
The exhaust system may further have a plurality of { HEAD ~ dosers } associated with { TAIL ~ the diffuser } and configured to inject fuel into the diffuser
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH