The advantages of a Hilborn injector are many but in order to maximize its potential, synchronization of the butterflies is required. Used in the last step of the synchronization process described in our tech support document, Injector Manifold Adjustments, the synchrometer insures that all cylinders have the same amount of air in the idle position. When correctly adjusted, the end result will maximize throttle response, part throttle drivability, and give the exhaust the sound you expect from your hot rod engine. The Synchrometer can be used with any individual runner manifold, injected or carbureted, and is supplied with any Hilborn EFI injector manifold kit purchase.