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An apparatus for modifying an exhaust stream of a diesel engine is provided. The apparatus includes a muffler arrangement having an exhaust inlet and an exhaust outlet in construct and arrange for sound attenuation therein. The apparatus also includes a catalytic converter arrangement positioned wit

An apparatus for modifying an exhaust stream of a diesel engine is provided. The apparatus includes a muffler arrangement having an exhaust inlet and an exhaust outlet in construct and arrange for sound attenuation therein. The apparatus also includes a catalytic converter arrangement positioned within the muffler arrangement. During operation, the exhaust flow is directed both through the muffler arrangement and the catalytic converter arrangement, to advantage.

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An apparatus for modifying an exhaust stream of a diesel engine; said apparatus comprising: (a) a muffler arrangement comprising: an outer shell having a first end, a second end, an exhaust inlet in said first end of said outer shell, and an exhaust outlet; (i) said muffler arrangement including a s

An apparatus for modifying an exhaust stream of a diesel engine; said apparatus comprising: (a) a muffler arrangement comprising: an outer shell having a first end, a second end, an exhaust inlet in said first end of said outer shell, and an exhaust outlet; (i) said muffler arrangement including a sound attenuation arrangement within said shell; (b) a catalytic converter arrangement positioned within said muffler arrangement; said catalytic converter arrangement comprising a converter core having an upstream surface and an opposite downstream surface; said converter core having an outer periphery; (c) an internal shell positioned within, and spaced from, said outer shell, to define an exhaust gas flow annulus therebetween; (i) said converter core being operably positioned within said internal shell; (d) said sound attenuation arrangement including a sound attenuator tube having an entry port spaced from said converter core downstream surface; (e) an exhaust flow arrangement for directing exhaust gases through said catalytic converter arrangement, in a direction of flow from said upstream surface to said downstream surface, whenever exhaust gases operably flow through said muffler arrangement from said exhaust inlet to said exhaust outlet; (f) an annular flow arrangement for directing exhaust gases, after the exhaust gases have been directed through the catalytic converter core, in a direction past the converter core, and around an outer periphery thereof, in a direction of flow from the catalytic core downstream surface toward the catalytic core upstream surface; (i) said annular flow arrangement directing flow of exhaust gases through said exhaust flow annulus and to said outlet; (ii) said annular flow arrangement directing flow of exhaust gases into said exhaust flow annulus at a location between said sound attenuator tube entry port and said converter core upstream surface such that in use gases can, but are not required to, flow from said converter core downstream surface into said exhaust flow annulus without being directed through said attenuator tube; and, (g) said shell being constructed and arranged with said exhaust gas inlet being positioned in said shell at a location closer to said catalytic converter core upstream surface than to said catalytic converter core downstream surface; and, said shell being constructed and arranged with said exhaust gas outlet being positioned in said shell at a location closer to said catalytic converter core upstream surface than to said catalytic converter core downstream surface; said catalytic converter core being physically positioned between said shell second end and both of said exhaust inlet and said exhaust outlet.