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The MSD 6BTM comes with a boost-retard adjuster that can be mounted inside the car or under the hood. We wanted to resist the urge to fiddle with it at full-throttle on the racetrack, so we mounted it under the hood. The box is boost-referenced and can be adjusted from 1-4 degrees of retard per pound of boost. The PROM allowed us to make passes at the recommended 1 degree of retard without detonation.