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Are any of the stand alone ECU's 50 state emissions legal? Any modification you make to the engine (header, cold air intake, throttle body, etc) is going to change the fuel mixture and ignition timing requirements. On an OBD2 car like this you are also likely to trip a check engine light from any mods you do. By having control of fuel and spark maps you can optimize fuel and spark for your mods and get more power.
Scott Tucker
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