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It will provide more fuel due to the more aggressive maps that it runs on. You might want to get a fuel pressure regulator or fuel computer to trim some fuel since it will run pretty rich. The computer will run a lot better with other mods...ie intake, header, exhaust, cams...etc. You won't see huge gains by just swapping the ecu.
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91 civic 4dr
b16a
14.8@94
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