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Others have posted about emissions out there, and from what I've gathered; it's the cat that's going to make the largest difference. Cams and cam gears can play a role, but you've already tackled it before so you should be good again.
Hang on to that stock stuff and when the time comes, just swap over.
I can't spaek about the accual emission from e85 because I havn't used it.
Headstuds are only required at 25 psi+
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