Yep, I saw that cobalt guy a year or two back also, ridiculous numbers. I think he was spiking up to like 500ft-lbs or something like that... But like you said, E85 had a big role in those numbers.
Here's another guy with a 2L Ecotec engine but this one put out a more reasonable 435whp
Time Attack Forums - View Single Post - The new Borgwarner EFR turbos + SR20 or SR22
EDIT: Found that ridiculous cobalt dyno:
http://www.miataturbo.net/diy-turbo-...e5/#post702554