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A nitrous oxide plate system having a plate adapted to fit in an intake pathway of an internal combustion engine. The plate has at least one central passage therethrough, and this passage forms a portion of the intake pathway when the plate is installed in the engine. The plate system also has a fir

A nitrous oxide plate system having a plate adapted to fit in an intake pathway of an internal combustion engine. The plate has at least one central passage therethrough, and this passage forms a portion of the intake pathway when the plate is installed in the engine. The plate system also has a first spray bar port passing into the central passage, and at least two spray bars that are adapted to be interchangeably installed in the first spray bar port. The at least two spray bars include a first spray bar having a first plurality of distribution orifices having a first total area, and a second spray bar having a second plurality of distribution orifices having a second total area. The second total area is different from the first total area. An interchangeable spray bar for a nitrous oxide plate system is also provided. The interchangeable spray bar has a hollow tube having an interior tube passage, an outer wall, a first end, a second end, and a plurality of distribution orifices passing through the outer wall. The interchangeable spray bar also has a fitting adapted to adjoin the first end of the hollow tube. The fitting has a hollow fitting passage therethrough in fluid communication with the interior tube passage when the fitting is adjoining the hollow tube. The hollow tube is adapted to removably fit within a nitrous oxide plate, and the fitting is adapted to engage the nitrous oxide plate to thereby hold the hollow tube within the nitrous oxide plate.

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What is claimed is: 1. A nitrous oxide plate system comprising: a plate adapted to fit in an intake pathway of an internal combustion engine, said plate having at least one central passage therethrough that forms a portion of said intake pathway when said plate is installed in said internal combust

What is claimed is: 1. A nitrous oxide plate system comprising: a plate adapted to fit in an intake pathway of an internal combustion engine, said plate having at least one central passage therethrough that forms a portion of said intake pathway when said plate is installed in said internal combustion engine; a first spray bar port passing into said central passage; at least two spray bars adapted to be interchangeably installed in said first spray bar port, said at least two spray bars comprising: a first spray bar having a first plurality of distribution orifices having a first total area; and a second spray bar having a second plurality of distribution orifices having a second total area, wherein said second total area is different from said first total area. 2. The nitrous oxide plate system of claim 1, wherein said first spray bar and said second spray bar are adapted to pass a supply of nitrous oxide or a supply of fuel into said central passage. 3. The nitrous oxide plate system of claim 1, wherein said first spray bar and said second spray bar are fixed against rotation when installed in said first spray bar port. 4. The nitrous oxide plate system of claim 1, further comprising means to fix said first spray bar and said second spray bar against rotation when installed in said first spray bar port. 5. The nitrous oxide plate system of claim 4, wherein said means to fix said first spray bar and said second spray bar against rotation when installed in said first spray bar port comprises a locking fitment between said first spray bar and said plate and said second spray bar and said plate, said locking fitment comprising a jam nut, a set screw, a key, or non-rotatable shape. 6. The nitrous oxide plate system of claim 1, wherein: said first spray bar comprises a first threaded hollow fitting rigidly attached to a first end of said first spray bar and forming a continuous hollow passage into said first spray bar, and a first closure plate rigidly attached to a second end of said first spray bar; said second spray bar comprises a second threaded hollow fitting rigidly attached to a first end of said second spray bar and forming a continuous hollow passage into said second spray bar, and a second closure plate rigidly attached to a second end of said second spray bar; and wherein said first threaded hollow fitting and said second threaded hollow fitting are interchangeably threadable into said first spray bar port. 7. The nitrous oxide plate system of claim 1, wherein said nitrous oxide plate system further comprises: a second spray bar port passing into said central passage; and at least two additional spray bars adapted to be interchangeably installed in said second spray bar port, said at least two additional spray bars comprising: a third spray bar having a third plurality of distribution orifices having a third total area; and a fourth spray bar having a fourth plurality of distribution orifices having a fourth total area, wherein said fourth total area is different from said third total area. 8. The nitrous oxide plate system of claim 7, wherein said first spray bar and said second spray bar are adapted to pass a supply of nitrous oxide into said central passage, and said third spray bar and said fourth spray bar are adapted to pass a supply of fuel into said central passage. 9. The nitrous oxide plate system of claim 8, wherein at least one of said first, second, third and fourth pluralities of distribution orifices comprise round openings and at least an other of said first, second, third and fourth pluralities of distribution orifices comprise elongated openings. 10. The nitrous oxide plate system of claim 8, further comprising: a nitrous oxide valve fluidly connectable between said first spray bar port and a supply of nitrous oxide and adapted to control a flow of nitrous oxide therebetween; a fuel valve fluidly connectable between said second spray bar port and a supply of fuel and adapted to control a flow of fuel therebetween; and at least one switch operable to control at least one of said nitrous oxide valve and said fuel valve. 11. The nitrous oxide plate system of claim 7, wherein said first spray bar and said second spray bar are adapted to pass a first supply of nitrous oxide into said central passage, and said third spray bar and said fourth spray bar are adapted to pass a second supply of nitrous oxide into said central passage. 12. An interchangeable spray bar for a nitrous oxide plate system, said interchangeable spray bar comprising: a hollow tube having an interior tube passage, an outer wall, a first end, a second end, and a plurality of distribution orifices passing through said outer wall; a fitting adapted to adjoin said first end of said hollow tube, said fitting having a hollow fitting passage therethrough in fluid communication with said interior tube passage when said fitting is adjoining said hollow tube, wherein said hollow tube is adapted to removably fit within a nitrous oxide plate, and said fitting is adapted to engage said nitrous oxide plate to thereby hold said hollow tube within said nitrous oxide plate, said fitting also having a first threaded portion adapted to threadingly engage a corresponding threaded hole in said nitrous oxide plate, and a second threaded portion adjacent said first threaded portion; a jam nut adapted to threadingly engage said second threaded portion of fitting; and an integral nut adapted to engage said fitting. 13. The interchangeable spray bar of claim 12, further comprising a closure plate attached to said second end of said hollow tube to thereby prevent fluid communication therethrough. 14. The interchangeable spray bar of claim 12, wherein said fitting is adapted to hold said hollow tube within said nitrous oxide plate in an axial direction along a length of said hollow tube, and in a rotational direction around a circumference of said hollow tube. 15. The interchangeable spray bar of claim 12, wherein said distribution orifices are round, oblong, rectangular or a combination thereof. 16. The interchangeable spray bar of claim 12, wherein said fitting is rigidly connected to said first end of said hollow tube to thereby prevent independent axial or rotational movement between said fitting and said hollow tube. 17. The interchangeable spray bar of claim 12, wherein said fitting further comprises a third threaded portion adapted to threadingly engage a nitrous oxide supply hose fitting. 18. The interchangeable spray bar of claim 12, wherein a cross-sectional area of said interior tube passage varies between said first end and said second end. 19. The interchangeable spray bar of claim 18, wherein said cross-sectional area decreases toward said second end. 20. The interchangeable spray bar of claim 12, wherein said plurality of distribution orifices comprise at least two orifices having different sizes from one another. 21. A nitrous oxide plate system comprising: a plate adapted to fit in an intake pathway of an internal combustion engine, said plate having at least one central passage therethrough that forms a portion of said intake pathway when said plate is installed in said internal combustion engine; a first nitrous spray bar port passing into said central passage; a plurality of nitrous spray bars, said plurality of nitrous spray bars being adapted to be interchangeably installed into said first nitrous spray bar port and project into said central passage when installed; said plurality of nitrous spray bars comprising: at least a first nitrous spray bar having a first total nitrous distribution orifice area; and at least a second nitrous spray bar having a second total nitrous distribution orifice area, said second total nitrous distribution orifice area being different from said first total nitrous distribution orifice area. 22. The nitrous oxide plate system of claim 21, further comprising: a second nitrous spray bar port passing into said central passage; a plurality of secondary nitrous spray bars, said plurality of secondary nitrous spray bars being adapted to be interchangeably installed into said secondary nitrous spray bar port and project into said central passage when installed; said plurality of secondary nitrous spray bars comprising: at least a first secondary nitrous spray bar having a first total secondary nitrous distribution orifice area; and at least a second secondary nitrous spray bar having a second total secondary nitrous distribution orifice area, said second total secondary nitrous distribution orifice area being different from said first total secondary nitrous distribution orifice area. 23. The nitrous oxide plate system of claim 21, further comprising: a first fuel spray bar port passing into said central passage; a plurality of fuel spray bars, said plurality of fuel spray bars being adapted to be interchangeably installed into said first fuel spray bar port and project into said central passage when installed; said plurality of fuel spray bars comprising: at least a first fuel spray bar having a first total fuel distribution orifice area; and at least a second fuel spray bar having a second total fuel distribution orifice area, said second total fuel distribution orifice area being different from said first total fuel distribution orifice area. 24. The nitrous oxide plate system of claim 23, further comprising: a secondary nitrous spray bar port passing into said central passage; and a secondary fuel spray bar port passing into said central passage. 25. The nitrous oxide plate system of claim 24, further comprising: a plurality of secondary nitrous spray bars, said plurality of secondary nitrous spray bars being adapted to be interchangeably installed into said secondary nitrous spray bar port and project into said central passage when installed; said plurality of secondary nitrous spray bars comprising: at least a first secondary nitrous spray bar having a first total secondary nitrous distribution orifice area; at least a second secondary nitrous spray bar having a second total secondary nitrous distribution orifice area, said second total secondary nitrous distribution orifice area being different from said first total secondary nitrous distribution orifice area; a plurality of secondary fuel spray bars, said plurality of secondary fuel spray bars being adapted to be interchangeably installed into said secondary fuel spray bar port and project into said central passage when installed; said plurality of secondary fuel spray bars comprising: at least a first secondary fuel spray bar having a first total secondary fuel distribution orifice area; and at least a second secondary fuel spray bar having a second total secondary fuel distribution orifice area, said second total secondary fuel distribution orifice area being different from said first total secondary fuel distribution orifice area. 26. The nitrous oxide plate system of claim 21, wherein said nitrous oxide plate system comprises: a single-stage dry nitrous system, a multi-stage dry nitrous system, a single stage wet nitrous system, or a multi-stage wet nitrous system.