Do you mean ecu remap as a add on chip is not neccesary on cars made after 1999? If the car is remapped it is virtually undetectable if say you had a crash and the insurance wanted to inspect your car for anything modified.As far as im aware there are not really any risks associated with the ecu upgrade as the 1.8t is capable of 400bhp with the right tuning.My avant has currently been remapped to 202 bhp and it is plenty different on acceleration.
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