{HEAD ~ The exhaust control system} includes an exhaust control valve, and {TAIL ~ a primary and a secondary exhaust purifying system} located downstream of the exhaust control valve 
includes
{ HEAD ~ The exhaust control system } includes an exhaust control valve , and { TAIL ~ a primary and a secondary exhaust purifying system } located downstream of the exhaust control valve
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH