{HEAD ~ Exhaust temperatures} in emission control devices may be directly controlled by an intake air throttle, fuel injection timing, and {TAIL ~ exhaust pressure} when an emission control device is placed between two variable geometry turbocharger exhaust turbines and coupled to a combustion engine 
{ HEAD ~ Exhaust temperatures } in emission control devices may be directly controlled by an intake air throttle , fuel injection timing , and { TAIL ~ exhaust pressure } when an emission control device is placed between two variable geometry turbocharger exhaust turbines and coupled to a combustion engine
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