Hi to all I'm thinking to change the ratio of a gearbox. The car is Ford focus mk2 1.6 petrol. I want to increase the 5th gear velocity. I have no problem to do that but I'm scared about the ecu and abs. May they give me problems after the the job? Now the car have 100km/h at 3000 rpm. After it will have 138km/h at 2500rpm. May this different ratio be recognized by the car?
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