The exhaust system may also have a controller configured to selectively control an amount of fuel injected by each of the plurality of dosers based on {HEAD ~ a velocity} of the exhaust adjacent to {TAIL ~ each doser} 
The exhaust system may also have a controller configured to selectively control an amount of fuel injected by each of the plurality of dosers based on { HEAD ~ a velocity } of the exhaust adjacent to { TAIL ~ each doser }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL