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Can't speak to jb4, but love my Racechip. Whenever I take it off my car when I go to the dealer it's a noticable decrease in power. Always a big difference when I put I back on. Have had it for a few years at this point and love it with no issues. I'm in CA so can't get better than 91 octane. It's a different car with it in. Usually run it on "6". When I mix with E85 I put it in "7" and feels like a big upgrade.
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