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E85 requires 20-30% more fuel than 93 pump gas, so you would need to upgrade to 550cc injectors to run E85 and 20 psi. I've never done an E85 rom tune before. It would need to be set up for 550's and for dual maps (one for E85 and one for 93 octane). I could take a try at it if you are interested. The rom tune would be $850.
Aaron
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