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An exhaust system for an engine comprises a cylinder head having an integral exhaust manifold to collect exhaust gas exiting the engine combustion chambers. An exhaust gas conduit in fluid communication with the exhaust manifold comprises an inlet end connected to the cylinder head, a portion that e

An exhaust system for an engine comprises a cylinder head having an integral exhaust manifold to collect exhaust gas exiting the engine combustion chambers. An exhaust gas conduit in fluid communication with the exhaust manifold comprises an inlet end connected to the cylinder head, a portion that extends towards an upper end of the internal combustion engine and an outlet end configured to define an inlet end of a multistage catalytic converter. The catalytic converter comprises a canister having an inlet end located adjacent the top of the engine and includes first and second catalyst substrates and a collector closing an outlet end of the canister. The outlet end of the canister is located adjacent to the bottom of the engine, and the first and the second catalyst substrates receive and convert constituents of exhaust gas passing from the inlet end of the canister to the outlet end.

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1. An exhaust treatment system for an internal combustion engine comprising: a cylinder head mounted to an internal combustion engine and having a series of integral exhaust gas conduits extending from combustion chambers to a central chamber that terminates in an outlet opening in the cylinder head

1. An exhaust treatment system for an internal combustion engine comprising: a cylinder head mounted to an internal combustion engine and having a series of integral exhaust gas conduits extending from combustion chambers to a central chamber that terminates in an outlet opening in the cylinder head to thereby define an integral exhaust manifold in the cylinder head that is operable to collect exhaust gas exiting the combustion chambers for passage therethrough;an exhaust gas conduit in fluid communication with the central chamber and configured to receive exhaust gas from the integral exhaust manifold through the outlet opening, the exhaust gas conduit comprising:an inlet end connected to the cylinder head and having an upwardly extending portion that extends towards an upper end of the internal combustion engine;an outlet end terminating the upwardly extending portion and configured to define an inlet end of a multistage catalytic converter, the multistage catalytic converter comprising:a canister having an inlet end located adjacent a top portion of the engine in fluid communication with the outlet end of the exhaust gas conduit, and configured to conduct exhaust gas from the exhaust gas conduit therethrough;a first catalyst coated substrate located adjacent the inlet end of the canister;a second catalyst coated substrate located adjacent an outlet end of the canister; anda collector closing an outlet end of the canister, the outlet end of the canister located adjacent to a bottom portion of the engine, the first and the second catalyst substrates configured to receive and to convert constituents of exhaust gas passing from the inlet end of the canister to the outlet end thereof. 2. The exhaust treatment system for an internal combustion engine of claim 1, further comprising: a heat exchanger assembly in fluid communication with the collector and configured to receive exhaust gas exiting the multistage catalytic converter and to extract waste heat from the exhaust gas for distribution to engine or vehicle components. 3. The exhaust treatment system for an internal combustion engine of claim 1, further comprising: a thermal management system in fluid communication with the heat exchanger and operable to collect recovered heat from the heat exchanger through thermal transfer fluid flowing therebetween. 4. The exhaust treatment system for an internal combustion engine of claim 3, wherein the thermal management system is configured to supply recovered heat to engine and vehicle components including the engine, a transmission, a vehicle compartment or a combination thereof. 5. The exhaust treatment system for an internal combustion engine of claim 1, further comprising: an exhaust gas recirculation system configured to divert a portion of the exhaust gas transiting the canister to the engine, the exhaust gas recirculation system comprising:an exhaust gas conduit having an inlet disposed between the first catalyst substrate and the second catalyst substrate; andan exhaust gas recirculation valve for regulating the flow of exhaust gas through the exhaust gas recirculation system. 6. The exhaust treatment system for an internal combustion engine of claim 1, wherein the first catalyst substrate includes a first concentration of a catalyst compound and the second catalyst substrate includes a second concentration of a catalyst compound. 7. The exhaust treatment system for an internal combustion engine of claim 1, wherein the catalyst compound includes platinum group metals such as platinum (Pt), palladium (Pd), rhodium (Rh) or other suitable oxidizing catalysts, or combination thereof. 8. The exhaust treatment system for an internal combustion engine of claim 1, wherein the first catalyst substrate and the second catalyst substrate comprise a single catalyst substrate comprising: a first catalyst zone extending axially from a location adjacent to the inlet end of the canister to a location intermediate of the single catalyst substrate; anda second catalyst zone extending axially from a location adjacent to the outlet end of the canister to a location intermediate of the single catalyst substrate, the first catalyst zone including a first concentration of a catalyst compound and the second catalyst zone comprising a second concentration of a catalyst compound. 9. The exhaust treatment system for an internal combustion engine of claim 8, wherein the catalyst compound includes platinum group metals such as platinum (Pt), palladium (Pd), rhodium (Rh) or other suitable oxidizing catalysts, or combination thereof. 10. An exhaust treatment system for an internal combustion engine comprising: a cylinder head mounted to an internal combustion engine and having a series of integrally cast exhaust gas conduits extending from combustion chambers to a central chamber that terminates in an outlet opening in the cylinder head to thereby define an integrally cast exhaust manifold operable to collect exhaust gas exiting the combustion chambers for passage therethrough;an exhaust gas conduit in fluid communication with the central chamber and configured to receive exhaust gas from the integrally cast exhaust manifold through the outlet opening, the exhaust gas conduit comprising:an inlet end connected to the cylinder head and having an upwardly extending portion that extends towards an upper end of the internal combustion engine;an arcuate portion terminating the upwardly extending portion and having an outlet end configured to define an inlet end of a multistage catalytic converter, the multistage catalytic converter comprising:a canister having an inlet end located adjacent a top portion of the engine and defined by the outlet end of the arcuate portion of the exhaust gas conduit and configured to conduct exhaust gas from the exhaust gas conduit into the canister;a first catalyst substrate located adjacent the inlet end of the canister;a second catalyst substrate located adjacent an outlet end of the canister;a collector closing an outlet end of the canister, the outlet end of the canister located adjacent to a bottom portion of the engine, the first and the second catalyst substrates configured to receive and convert constituents of exhaust gas passing from the inlet end of the canister to the outlet end thereof;a heat exchanger assembly in fluid communication with the collector and configured to receive exhaust gas exiting the multistage catalytic converter and to extract waste heat from the exhaust gas for distribution to engine or vehicle components; anda thermal management system in fluid communication with the heat exchanger and operable to collect recovered heat from the heat exchanger through thermal transfer fluid flowing therebetween and wherein the thermal management system is configured to supply recovered heat to an engine and vehicle components including the engine, a transmission, a vehicle compartment or a combination thereof.