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A fuel injector adapter for providing nitrous oxide to an internal combustion engine is disclosed. The nozzle has a fuel injector passage, having a central axis and terminating at an injector outlet, for passing fuel from a fuel injector to an engine. The nozzle also has one or more first auxiliary

A fuel injector adapter for providing nitrous oxide to an internal combustion engine is disclosed. The nozzle has a fuel injector passage, having a central axis and terminating at an injector outlet, for passing fuel from a fuel injector to an engine. The nozzle also has one or more first auxiliary passages, which may be arranged in an annular pattern around the fuel injector passage, and which terminate at first outlets. The nozzle furthermore may have one or more second auxiliary passages, which also may be arranged in an annular pattern around the fuel injector passage, and which terminate at second outlets. The first auxiliary passages and second auxiliary passages are adapted to supply nitrous oxide or other additional combustion reactants to the engine. The nozzle may be attached to an engine intake and may be adapted to fit between a fuel injector and an engine without substantial modification to the engine.

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1. A nozzle for providing nitrous oxide to an internal combustion engine, the nozzle comprising:a fuel injector passage, having a central axis and terminating at an injector outlet, for passing fuel from a fuel injector therethrough; a first auxiliary passage, terminating at a first outlet, for pass

1. A nozzle for providing nitrous oxide to an internal combustion engine, the nozzle comprising:a fuel injector passage, having a central axis and terminating at an injector outlet, for passing fuel from a fuel injector therethrough; a first auxiliary passage, terminating at a first outlet, for passing nitrous oxide therethrough; a second auxiliary passage, terminating at a second outlet, for passing nitrous oxide or additional fuel therethrough; and a diffuser plate located proximal to the first outlet and the second outlet. 2. The nozzle of claim 1, wherein the diffuser plate is angled relative to the central axis.3. The nozzle of claim 2, wherein the diffuser plate is angled by about 5 degrees to about 90 degrees relative to the central axis.4. The nozzle of claim 2, wherein the diffuser plate is angled by about 10 degrees to about 30 degrees relative to the central axis.5. A nozzle for providing nitrous oxide to an internal combustion engine, the nozzle comprising:a fuel injector passage, having a central axis and terminating at an injector outlet, for passing fuel from a fuel injector therethrough; a first auxiliary passage, terminating at a first outlet, for passing nitrous oxide therethrough; a second auxiliary passage, terminating at a second outlet, for passing nitrous oxide or additional fuel therethrough; and wherein the first outlet and the second outlet comprise radial outlets. 6. The nozzle of claim 5, wherein the first outlet and second outlet are rectangular passages.7. The nozzle of claim 6, wherein the first outlet and second outlet have a width (in a plane orthogonal to the central axis of the fuel injector passage) of about 0.050 inches to about 0.150 inches, and a height (in a plane parallel with the central axis of the fuel injector passage) of about 0.010 inches to about 0.040 inches.8. The nozzle of claim 6, wherein the first outlet and second outlet have a width (in a plane orthogonal to the central axis of the fuel injector passage) of about 0.100 inches and a height (in a plane parallel with the central axis of the fuel injector passage) of about 0.020 inches.9. The nozzle of claim 5, wherein the first outlet and second outlet are each angled in a helical fashion relative to the central axis.10. The nozzle of claim 9, wherein the first outlet and second outlet are each angled toward the central axis by about 5 degrees to about 90 degrees, and are angled in a plane orthogonal to the central axis by about 0 degrees to about 90 degrees relative to the outer surface of the nozzle at the respective outlet.11. The nozzle of claim 9, wherein the first outlet and second outlet are each angled toward the central axis by about 45 degrees to about 60 degrees, and are angled in a plane orthogonal to the central axis by about 40 degrees to about 60 degrees relative to the outer surface of the nozzle at the respective outlet.12. A nozzle for providing nitrous oxide to an internal combustion engine, the nozzle comprising:a fuel injector passage, having a central axis and terminating at an injector outlet, for passing fuel from a fuel injector therethrough; a first auxiliary passage, terminating at a first outlet, for passing nitrous oxide therethrough; a second auxiliary passage, terminating at a second outlet, for passing nitrous oxide or additional fuel therethrough; and wherein the first outlet and the second outlet are on opposite sides of the fuel injector outlet. 13. A nozzle for providing nitrous oxide to an internal combustion engine, the nozzle comprising:a fuel injector passage, having a central axis and terminating at an injector outlet, for passing fuel from a fuel injector therethrough; a first auxiliary passage, terminating at a first outlet, for passing nitrous oxide therethrough; a second auxiliary passage, terminating at a second outlet, for passing nitrous oxide or additional fuel therethrough; and wherein the first outlet and the second outlet are located about 10 degrees to about 180 degrees apart relative to the central axis of the fuel injector passage. 14. The nozzle of claim 13, wherein the first outlet and the second outlet are located about 45 degrees to about 135 degrees apart relative to the central axis of the fuel injector passage.15. The nozzle of claim 13, wherein the first outlet and the second outlet are located about 90 degrees apart relative to the central axis of the fuel injector passage.16. A nozzle for providing combustion reactants to an internal combustion engine, said nozzle comprising:an interior cup having an injector inlet end and an outlet end opposed to the injector inlet end, the interior cup comprising: a fuel injector receptacle in the injector inlet end; a fuel injector passage, the fuel injector passage having a central axis and terminating at the outlet end; a first auxiliary input location; a plurality of first auxiliary passages arranged in an annular pattern around the central axis and radially outward of the fuel injector passage and extending from the first auxiliary input location to the outlet end; a first annular ring disposed around the interior cup proximal to the first auxiliary input location, the first annular ring comprising a first auxiliary input port; and a receptacle cup disposed around the interior cup proximal to the outlet end; wherein the fuel injector passage is adapted to pass fuel from a fuel injector to the outlet end, the first auxiliary input port is adapted to pass a first combustion reactant to the plurality of first auxiliary passages, and the plurality of first auxiliary passages are adapted to pass the first combustion reactant to the outlet end. 17. The nozzle of claim 16, wherein the receptacle cup is an existing fuel injector receptacle in an engine.18. The nozzle of claim 16, wherein the receptacle cup is welded to an engine intake.19. The nozzle of claim 16, wherein the receptacle cup is threaded into an engine intake.20. The nozzle of claim 16, wherein the interior cup is threaded into the receptacle cup.21. The nozzle of claim 16, wherein the interior cup is retained in the receptacle cup by one or more o-ring seals.22. The nozzle of claim 16, wherein the plurality of first auxiliary passages comprises 2 to 16 first auxiliary passages.23. The nozzle of claim 16, wherein the plurality of first auxiliary passages comprises 5 to 12 first auxiliary passages.24. The nozzle of claim 16, wherein the plurality of first auxiliary passages comprises 7 to 9 first auxiliary passages.25. The nozzle of claim 16, wherein the first auxiliary input location comprises an annular groove.26. The nozzle of claim 16, wherein the first annular ring further comprises an inner annular groove.27. The nozzle of claim 16, wherein the first combustion reactant is nitrous oxide, gasoline, diesel fuel, natural gas, propane, nitromethane, alcohol or an alcohol blend.28. The nozzle of claim 16, wherein the interior cup further comprises:a second auxiliary input location; a plurality of second auxiliary passages arranged in an annular pattern around the central axis and radially outward of the plurality of first auxiliary passages and extending from the second auxiliary input location to the outlet end; and a second annular ring disposed around the interior cup proximal to the second auxiliary input location, the second annular ring comprising a second auxiliary input port; wherein the second auxiliary input port is adapted to pass a second combustion reactant to the plurality of second auxiliary passages, and the plurality of second auxiliary passages are adapted to pass the second combustion reactant to the outlet end. 29. The nozzle of claim 28, wherein the plurality of second auxiliary passages comprises 2 to 16 second auxiliary passages.30. The nozzle of claim 28, wherein the plurality of second auxiliary passages comprises 5 to 12 second auxiliary passages.31. The nozzle of claim 28, wherein the plurality of second auxiliary passages comprises 7 to 9 second auxiliary passages.32. The nozzle of claim 28, wherein the second combustion reactant is nitrous oxide, gasoline, diesel fuel, natural gas, propane, nitromethane, alcohol or an alcohol blend.33. The nozzle of claim 28, wherein the second annular ring further comprises an inner annular groove.