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For the gains on a new style fuel injected computer controlled engine, it's not worth the hassle. Older engines with less efficent combustion chamber and ignition spark would benefit more from indexing but still not much. Indexing the plugs were for the guys that were looking to get all the power they could from the motor that were limited by rules and classes where everyone was close and they needed the extra 1-3hp. If you are still wanting to do this, Summit and Jegs along with other places sells a indexing tool that helps you index the plug off the motor.

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