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Installed Hartge chip on my F11 535dx (2012) today in their shop in Beckingen, DE. First impression is very good, acceleration improvement is noticeable. 80-200 km/h before install was 21 sec and post install just below 17 sec. Probably too lazy to shoot any videos but do recommend their service. According to Hartge self install not advised. Whole process took 5 hours, only complaint I have is lack of wifi in their waiting lounge.
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