I am a racecar driver who also happens to own a 330Ci. Last year when I was up at the Summit Point racetrack I saw a good friend of mine. He saw my new 330Ci and said "We need to get that into our shop so we can develop the ECU upgrade for it!" The shop he was talking about is AutoThority, and of course I let them use my car. Well, they're done and my ECU was upgraded on this past Tuesday. I got a 14 horsepower gain at 5000 RPMs. Anyway, they told me they ALSO have the upgrade for the M5, which is why I am posting. So, if you are interested in checking it out call my friend, Payton Wilson at Autothority. He is the Shop Manager and the number is: (703)323-7830. Barry