4 Cylinder NA and TurboThis section is for questions pertaining to stock or modified 4 cylinders, including the performance 2.3L applications
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they BB and DB interchange as far as function goes, but they have different programs, and if I had to guess, the Federal models allow the car to run a little dirtier and get a little better hp and/or gas mileage.
On the 98-up Escort ZX2's this holds very true. Typically on that car, the older federal pcms produce more power and mileage even though Ford rates them as the "same".
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