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An improved exhaust system for a diesel engine and an improved overhead exhaust manifold segment therefore wherein the improvement comprises a plurality of catalytic converter elements removably positionable in the overhead exhaust manifold over the outlet ends of a series of exhaust port legs exten

An improved exhaust system for a diesel engine and an improved overhead exhaust manifold segment therefore wherein the improvement comprises a plurality of catalytic converter elements removably positionable in the overhead exhaust manifold over the outlet ends of a series of exhaust port legs extending upwardly to the bottom of the overhead exhaust manifold from the cylinder exhaust ports.

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What is claimed is: 1. In an exhaust system for a diesel engine including a series of pairs of upwardly extending exhaust port legs having upper outlet ends for delivering exhaust into an overhead exhaust manifold extending substantially horizontally over said diesel engine, said overhead exhaust m

What is claimed is: 1. In an exhaust system for a diesel engine including a series of pairs of upwardly extending exhaust port legs having upper outlet ends for delivering exhaust into an overhead exhaust manifold extending substantially horizontally over said diesel engine, said overhead exhaust manifold having a longitudinal interior passage and a longitudinally extending outer wall surrounding said interior passage, the improvement comprising: a plurality of catalytic converter elements removably insertable through insert openings in said longitudinally extending outer wall into said overhead exhaust manifold such that said catalytic converter elements are positioned over said upper outlet ends of said exhaust port legs; said insert openings being in opposing pairs on opposite sides of said longitudinally extending outer wall; said catalytic converter elements being removably insertable in said overhead exhaust manifold through said insert openings in opposing pairs such that each of said opposing pairs of said catalytic converter elements forms a lateral upright V arrangement in said longitudinal interior passage; and each of said catalytic converter elements comprising a diesel oxidation catalyst on a substrate comprising a corrugated metal foil. 2. The exhaust system of claim 1 wherein the improvement further comprises a separate one of said catalytic converter elements being removably insertable in said overhead exhaust manifold over each of said upper outlet ends of said exhaust port legs. 3. The exhaust system of claim 1 wherein the improvement further comprises said catalytic converter elements being removably insertable in said overhead exhaust manifold such that substantially all of said exhaust delivered from said upper outlet ends of said exhaust port legs will flow through said catalytic converter elements into an upper longitudinal portion of said longitudinal interior passage. 4. The exhaust system of claim 1 wherein the improvement further comprises said opposing pairs of said catalytic converter elements being receivable in opposing pairs of element holding slots extending into said longitudinal interior passage of said overhead exhaust manifold in a lateral upright V arrangement. 5. The exhaust system of claim 1 wherein said overhead exhaust manifold comprises a plurality of sections assembled in series, each of said sections having two of said pairs of upwardly extending exhaust port legs connected thereto and wherein said improvement further comprises two opposing pairs of said catalytic elements being removably insertable in each of said sections. 6. The exhaust system of claim 1 wherein the improvement further comprises said substrate comprising a plurality of layers of said corrugated metal foil. 7. The exhaust system of claim 1 wherein the improvement further comprises: each of said element holding slots having an outer end; said overhead exhaust manifold having said insert openings at said outer ends of said element holding slots, said catalytic converter elements being removably receivable through said insert openings; and removable covers for closing said insert openings. 8. The exhaust system of claim 7 wherein the improvement further comprises each of said catalytic converter elements having an outer perimeter and a sealing gasket attached around said outer perimeter such that each of said catalytic converter elements is completely surrounded by one of said sealing gaskets and said sealing gaskets are effective for sealing between said catalytic converter elements and said element holding slots and between said catalytic converter elements and said covers. 9. In an overhead exhaust manifold segment for a diesel engine having a longitudinal interior passage, a longitudinal wall surrounding said longitudinal interior passage, and a plurality of openings in a lower portion of said longitudinal wall for receiving an engine exhaust, the improvement comprising: four catalytic converter elements removably insertable in said overhead exhaust manifold segment through insert openings in said longitudinal wall in a manner effective such that said engine exhaust will flow through said catalytic converter elements into an upper longitudinal portion of said interior passage; said insert openings being in at least one opposing pair on opposite sides of said longitudinally extending outer wall; said catalytic converter elements being removably insertable in two opposing pairs in said overhead exhaust manifold segment through said insert openings; each of said opposing pairs of said catalytic converter elements forming a lateral upright V arrangement in said interior passage; and each of said catalytic converter elements comprising a diesel oxidation catalyst on a substrate comprising a corrugated metal foil. 10. The overhead exhaust manifold segment of claim 9 wherein the improvement further comprises each of said opposing pairs of said catalytic converter elements being insertable in an opposing pair of element holding slots extending into said longitudinal interior passage in a lateral upright V arrangement. 11. The overhead exhaust manifold segment of claim 9 wherein the improvement further comprises said substrate comprising a plurality of layers of said corrugated metal foil. 12. The overhead exhaust manifold segment of claim 10 wherein the improvement further comprises: said element holding slots having outer ends; said longitudinal wall having said insert openings therethrough at said outer ends for inserting said catalytic converter elements into said element holding slots; and removable covers for closing said insert openings. 13. The overhead exhaust manifold segment of claim 12 wherein the improvement further comprises each of said catalytic converter elements having an outer perimeter and a sealing gasket attached around said outer perimeter such that each of said catalytic converter elements is completely surrounded by one of said sealing gaskets and said sealing gaskets are effective for sealing between said catalytic converter elements and said element holding slots and between said catalytic converter elements and said covers.