I wanted to mention that I've also been pushing the car hard on stock hardware and E85:
http://www.e90post.com/forums/showthread.php?t=748583
While I'm looking forward to getting the Helix FMIC installed, I think running hard for short bursts on stock hardware is fine. Not that many of us go out and run road courses or just full throttle for more than 10 seconds very often.