Ask the Denver 335i owners at e90post.com
If your a pilot, just splurge the $795 for a piggy-back ecu from Attache. Less expensive than the PROCEED (by almost 50%) with more HP, its made its way to the top of my mod list. Of course I dont think its totally out yet and $795 is the target price, so it could be more..........or less...
I know I dont make pilot money, but I'm sure I also dont have pilot bills...
Here is a link, maybe you could ask them if their tune could help you out...
http://www.e90post.com/forums/showthread.php?t=96227
Good luck!