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JB's are from the states where Burger Motorsports would have done all their R&D on cars powered with either 91 or 93 octane rated fuels anyway. If its been running ok thus far on 91, then I wouldnt see an issue with it.
It might be worth forking out that little bit extra for the JB4, I think you might be able to check for detination issues (I am not sure about this though).
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