RB, looking at Happy's posts in the thread you linked, it looks his was hotroded by RMS, and their product didn't appear to be the ESS you linked. Am I missing something? I note that NickP? in Munich was a bit cynical about the RMS kit, and its impact on the M54 engine .... wouldn't want to spend over $5k just to damage the M54, even if driven conservatively .....

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2006 X5 3.0 6-spd w/Evo UUC ssk
sport/premium pkgs
born Valentine's Day, 2006.