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Here’s a sneak-peek inside the test mule. The kit requires 91-octane fuel to help prevent detonation, but a lot of real-world testing and tuning was done with a wide array of not-cheap test equipment. Banks has burned through many tanks of gas everywhere from sea level to some of the highest mountain passes in the Rockies—all to make sure that by the time you bolt the kit to your Jeep you won’t have any tuning issues.