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Robispec had issues with his mostly stock fuel system. He blamed the e85 if I remember correctly. After cleaning and replacing parts, he stuck with E85.
Other than the occasional fire, I'm not hearing about many issues with E85.
The twins are well-suited to E85 because of their high compression. The fuel's octane allows more timing, getting more powah. I'm not sure it's worth the effort, though, without going FI. With FI, there's a lot more power to gain. I've never seen an e85 versus 91 or 93 drag race comparison.
And mad-sb has it right on finding a good tuner. I've seen a long line of people who felt burnt by mail-order tunes. It seems more people are happy with the mail order tunes than not, but the odds don't look that great.
In the end, I would find a local tuner with massive experience and a good reputation. I hear there are also remote dyno tunes possible, but that doesn't sound good to me. A remote tuner won't hear or see the car's reactions as well. They might miss some subtle knocking. Maybe I'm wrong on that, though.
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