I know I don't own a 3, but I do have the N54, so I just wanted to add my experience.
I want to thank Terry and SpecialtyZ in Chatsworth, Ca for there time and expert help.
Terry, well what is there to say that hasn't been said already, but for All those out there who are looking into tuning there BMW, N54 and N55, this is your guy (this is my opinion due to that I have the JB4 ) talk about support, he is there to answer your questions and today ( Feb 10, 2012 ) was no different if emailing or on forums, he was supportive and patient and we had a great day, well at least my wife and I did. ( Terry or Mike can chime in if they want )
Here my info
2008 535i E60
JB 4 - Alpha Firmware 2-7-2012
Eisenmann Exhaust: Race
91 Octane - 40% ( California and there low octane, BOO !! )
E85 - 60% - just going by there quoted 105 octane, so don't hate on me
FYI - Been running 50/50 for the past six months with no issues
For this Dyno:
When I fueled up I had around 1-2 gallons left, when I added 9 gallons of E85 and 7 gallons of 91.
Here's the file
Here is one Video of the Dyno Run Action !!