See http://forums.bimmerforums.com/forum/showthread.php?p=12528869#post12528869

Please note that this chip is only for the S38 engine in an M6 or M5:)

$160 shipped

That is a good deal.

I would have bought it, but it turns out my car has a Dinan chip already that the previous owner forgot about.

That is a good deal.

I would have bought it, but it turns out my car has a Dinan chip already that the previous owner forgot about. Your right, the difference in the chips would not be worth the cost of switching.