A self-cooling exhaust gas injection device for distributing exhaust gases into an air intake distributor of an internal combustion engine, comprising: a return pipe injecting said exhaust gases into an interior of said intake distributor, said return pipe having an upstream end receiving exhaust gases and an opposing closed downstream end, said return pipe extending across at least a portion of an interior length of said distributor; and said return pipe including at least one outlet orifice, said outlet orifices distributing said injected gases into an intake air stream surrounding said return pipe within said intake distributor; wherein said intake air stream flows over and completely surrounds all sides of said return pipe with the exception of said upstream end; and wherein said outlet orifices are configured and positioned to uniformly distribute said injected gases into said intake air stream to each intake cylinder riser pipe, wherein the return pipe comprises: a first return pipe segment (1 1), configured to passively cool said exhaust gases by exposure to said intake air stream, entering said distributor and flowing about an exterior of said first return pipe segment in said air intake distributor; and a second return pipe segment (1 2), receiving passively cooled exhaust gases from said first return pipe segment (1 1), said second return pipe segment (1 2) equipped with said outlet orifices, wherein said first segment (1 1) and said second segment (1 2) are arranged in a side by side parallel configuration with each other, each of said first and second segments (1 1, 1 2) extending substantially across said interior length of said air intake distributor, characterized in that said return pipe is an elongated tubular pipe having a U-shape; wherein one leg of said U-shape forms said first return pipe segment (1 1) and a second leg of said U-shape forms said second return pipe segment (1 2); and wherein said closed downstream end of said return pipe is formed by a bottom of said 'U' of said U-shape. a return pipe injecting said exhaust gases into an interior of said intake distributor, said return pipe having an upstream end receiving exhaust gases and an opposing closed downstream end, said return pipe extending across at least a portion of an interior length of said distributor; and said return pipe including at least one outlet orifice, said outlet orifices distributing said injected gases into an intake air stream surrounding said return pipe within said intake distributor; wherein said intake air stream flows over and completely surrounds all sides of said return pipe with the exception of said upstream end; and wherein said outlet orifices are configured and positioned to uniformly distribute said injected gases into said intake air stream to each intake cylinder riser pipe, wherein the return pipe comprises: a first return pipe segment (1 1), configured to passively cool said exhaust gases by exposure to said intake air stream, entering said distributor and flowing about an exterior of said first return pipe segment in said air intake distributor; and a second return pipe segment (1 2), receiving passively cooled exhaust gases from said first return pipe segment (1 1), said second return pipe segment (1 2) equipped with said outlet orifices, wherein said first segment (1 1) and said second segment (1 2) are arranged in a side by side parallel configuration with each other, each of said first and second segments (1 1, 1 2) extending substantially across said interior length of said air intake distributor, characterized in that said return pipe is an elongated tubular pipe having a U-shape; wherein one leg of said U-shape forms said first return pipe segment (1 1) and a second leg of said U-shape forms said second return pipe segment (1 2); and wherein said closed downstream end of said return pipe is formed by a bottom of said 'U' of said U-shape. a first return pipe segment (1 1), configured to passively cool said exhaust gases by exposure to said intake air stream, entering said distributor and flowing about an exterior of said first return pipe segment in said air intake distributor; and a second return pipe segment (1 2), receiving passively cooled exhaust gases from said first return pipe segment (1 1), said second return pipe segment (1 2) equipped with said outlet orifices,