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      04-11-2007, 01:29 PM   #29
peppernick
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Drives: E92 335D, Z4M Roadster
Join Date: Jan 2007
Location: London, UK

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Depending on how they do it. It's up to the individual. Some take the ECU out, some do it via the OBD port. However, only very recently that tuners were able to interogate the 335 ECU via the OBD port.