I'm not sure about your setup but I have switched and speed density computer into a factory mass air equipped 89 Mustang and didn't have any problems, no check engine light, nothing! I don't think you will have any problems and if you do it should only be with the two wires going to your VSS, may have to disconnect them or at least put a switch or something on them so you can break the circuit. The worst you could do would be fry the speed density computer, but I doubt it would. Good luck.
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88GT, 14deg timing, 3.73's, BBK cold air induction, alum. driveshaft, 65mm TB, 75mm Bullet MAF, steeda tri-ax, trick flow intake, 24lb. injectors,
holley adj. fuel regulator, BBK 190lph fuel pump, BBK long tubes, SHD T-5Z, American Thunder flowmaster exhaust, x-pipe, 13.9@103.2 on street tires, more to come!
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