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An exhaust mixer (16) is provided for use in an engine exhaust system (10) downstream from an additive injector (14). The mixer (16) includes eight vanes (20), with four of the vanes (20A) extending from a first side (22) of the mixer (16) and arranged in an equally spaced circumferential array arou

An exhaust mixer (16) is provided for use in an engine exhaust system (10) downstream from an additive injector (14). The mixer (16) includes eight vanes (20), with four of the vanes (20A) extending from a first side (22) of the mixer (16) and arranged in an equally spaced circumferential array around a central axis (24), and the other four of the vanes (20B) extending from an opposite side (26) of the mixer (16) and arranged opposite from the other four vanes (20A) in an equally spaced circumferential array.

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1. An exhaust mixer for use in an engine exhaust system downstream from an additive injector, the mixer comprising: a pair of interlocked blade structures, each of the blade structures comprising a first pair of vanes extending from a first side of the blade structure and a second pair of vanes exte

1. An exhaust mixer for use in an engine exhaust system downstream from an additive injector, the mixer comprising: a pair of interlocked blade structures, each of the blade structures comprising a first pair of vanes extending from a first side of the blade structure and a second pair of vanes extending from an opposite side of the blade structure;wherein each of the blade structures further comprises a spine with the first and second pairs of vanes extending from the spine; andwherein each of the spines is perforated. 2. The exhaust mixer of 1 wherein each of the vanes of each pair of vanes extends from the corresponding blade structure at a mixing angle that is congruent with the mixing angle of the other vane of the pair. 3. The exhaust mixer of claim 2 wherein the mixing angles of each pair of vanes are in opposite directions. 4. The exhaust mixer of claim 1 wherein each of the blade structures is a unitary part that is interlocked with the other blade structure. 5. The exhaust mixer of claim 4 wherein the blade structures are identical to each other and are interlocked in opposite orientations. 6. The exhaust mixer of claim 1 wherein each of the spines lies in a plane parallel to a central axis of the mixer. 7. The exhaust mixer of claim 1 wherein each of the spines includes a notch sized to receive the spine of the other blade structure. 8. An exhaust mixer for use in an engine exhaust system downstream from an additive injector, the mixer comprising: a pair of interlocked blade structures, each of the blade structures comprising a first pair of vanes extending from a first side of the blade structure and a second pair of vanes extending from an opposite side of the blade structure:wherein each of the blade structures further comprises a spine with the first and second pairs of vanes extending from the spine: andwherein mount flanges extend from opposite ends of each of the spines. 9. The exhaust mixer of claim 1 wherein the blade structures are arranged normal to each other. 10. The exhaust mixer of claim 1 wherein the vanes are all of the same size and shape. 11. The exhaust mixer of claim 8 wherein each of the vanes of each pair of vanes extends from the corresponding blade structure at a mixing angle that is congruent with the mixing angle of the other vane of the pair. 12. The exhaust mixer of claim 11 wherein the mixing angles of each pair of vanes are in opposite directions. 13. The exhaust mixer of claim 8 wherein each of the blade structures is a unitary part that is interlocked with the other blade structure. 14. The exhaust mixer of claim 13 wherein the blade structures are identical to each other and are interlocked in opposite orientations. 15. The exhaust mixer of claim 8 wherein each of the spines lies in a plane parallel to a central axis of the mixer. 16. The exhaust mixer of claim 8 wherein each of the spines includes a notch sized to receive the spine of the other blade structure. 17. The exhaust mixer of claim 8 wherein the blade structures are arranged normal to each other. 18. The exhaust mixer of claim 8 wherein the vanes are all of the same size and shape. 19. An exhaust mixer for use in an engine exhaust system downstream from an additive injector, the mixer comprising: a pair of interlocked blade structures, each of the blade structures comprising a first pair of vanes extending from a first side of the blade structure and a second pair of vanes extending from an opposite side of the blade structure; andwherein at least one the vanes is bifurcated to define at least two end baffles extending from the vane. 20. The exhaust mixer of claim 19 wherein the at least two end baffles each have an orientation relative to the mixer that is different from the orientation of the other of the at least two end baffles. 21. The exhaust mixer of claim 19 wherein the at least two end baffles each have a size and shape that differs from the size and shape of the other of the at least two end baffles. 22. An exhaust mixer for use in an engine exhaust system downstream from an additive injector, the mixer comprising; eight vanes, four of the vanes extending from a first side of the mixer and arranged in an equally spaced circumferential array around a central axis, the other four of the vanes extending from an opposite side of the mixer and arranged opposite from the other four vanes in an equally spaced circumferential array;wherein two of the vanes on the first side and two of the vanes on the second side extend from a planar spine. 23. The exhaust mixer of claim 22 wherein each of the vanes extends from the mixer at a mixing angle that is congruent with the mixing angle of the other vanes. 24. The exhaust mixer of claim 23 wherein the mixing angles of the vanes on the first side are in an opposite directions from the mixing angle of the vanes on the opposite side of the mixer. 25. The exhaust mixer of claim 22 wherein the planar spine lies in a plane parallel to a central axis of the mixer. 26. The exhaust mixer of claim 22 wherein the planar spine is perforated. 27. The exhaust mixer of claim 22 wherein at least one the vanes is bifurcated to define at least two end baffles extending from the vane. 28. The exhaust mixer of claim 27 wherein the at least two end baffles each have an orientation relative to the mixer that is different from the orientation of the other of the at least two end baffles. 29. The exhaust mixer of claim 27 wherein the at least two end baffles each have a size and shape that differs from the size and shape of the other of the at least two end baffles. 30. An exhaust mixer for use in an engine exhaust system downstream from an additive injector, the mixer comprising: eight vanes, four of the vanes extending from a first side of the mixer and arranged in an equally spaced circumferential array around a central axis, the other four of the vanes extending from an opposite side of the mixer and arranged opposite from the other four vanes in an equally spaced circumferential array;wherein two of the vanes on the first side and two of the vanes on the second side extend from a planar spine; andwherein mount flanges extend from opposite ends of the planar spine.