From what I understand, and I've never used it before, but the box will help the vehicle run the ethanol more efficiently. The only modifications to the vehicle would be some fuel tubing, seals etc... that may not withstand the ethanol from breaking it down. But, I've also read that since the 90's, most vehicles should be able to run it with little problem. I doubt the vehicle would be destroyed, or the engine for that matter. But again, I've never tried. Through what I read, it pretty much sounded like their shouldn't be any problems....
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'03 H2
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