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I believe all they do is fiddle with the ECU. I have an A4 1.9 TDI, originally it only had 100hp, but I had it ''chipped''(ECU remapped), and now it develops 180hp. The extra torque is amazing, still the same top speed but gets there quicker. Also it returns between 5 and 7 miles per gallon more. I'm very pleased with it, just make sure you change the cam-belt within the recommended time.
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