Abstract: A system to dose and mix hydrocarbon is disclosed, which includes a twin-parallel turbocharger equipped engine, a mixer coupled to exhaust outlets of the turbines of the twin-parallel turbocharger equipped engine, and a hydrocarbon dosing unit coupled to the mixer. A method of manufacturing the compact hydrocarbon dosing and mixing system is also disclosed, as is a method of dosing and mixing hydrocarbon.

Abstract: An exhaust after-treatment system for an internal combustion engine is provided having an exhaust passage in fluid communication with the exhaust manifold of the engine. A turbocharger coupled to the exhaust passage is operatively driven by a first portion of exhaust gases exiting the exhaust manifold. A bypass line is disposed parallel to the turbocharger, and fluidly coupled to the exhaust passage upstream and downstream of the turbocharger. The bypass line receives a second portion of the exhaust gases exiting the exhaust manifold. A fuel injector disposed in the bypass line injects a pre-determined amount of fuel in the bypass line to the second portion of the exhaust gases. An exhaust after-treatment module located downstream of the turbocharger and the bypass line receives the mixture of the first portion and the second portion of the exhaust gas.