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I wrote earlier on this in another forum. I used RaceChip in my Audi A8 4.0T. It was great for about two weeks, then it started to consistently put my engine in limpmode with an engine light coming on. I had to fight for my refund, becase RaceChip insisted that an engine checklight is a normal side-affect when using RaceChip. This was about 3 years ago, not sure if anything has changed with their products / service since then, but use at your own risk.
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