The Q-Chip for the 2.0L ABA engined cars provides substantial gains in torque and horsepower at all rpm. The Q-Chip totally changes your once docile (some say anemic) Mk3 into a spirited runner. Zero to sixty times (Vericom tested) improve by a full second! The car's ability to run to the new, higher 6900 rpm redline is quickened, and the motor becomes much more responsive, which is a nice change on this large-stroke motor. This is the perfect addition to any new Golf or Jetta (or Passat). The ECU is normally found on the passenger side of the raintray between the windshield and hood. The ECU will have a sticker facing upwards, please copy down the number on the sticker.