I thought the NGK BKR6EQUP was the plug for the M54 engine? That's what I installed around 8k miles ago. Continues to run smoothly, and I am seeing about +1 mpg since doing this and changing the 02 sensors.

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