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