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Ive run both extensively I can't from the seat really tell any difference if its there it's a little placebo maybe, I think it's one of those things that youd have to dyno and do data logging to see it otherwise it's only in your wallet.
*I do make it a point to run 93 myself but Ive really only got 2 stations that in my radius that are practical, one I drive right by it to/from work or I wouldn't be doing 93 most likely.
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