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a grounding kit is 1-2hp at best and even that is debatable. The ignition amplifier would help prevent spark blow out or misfiring as well as all the other stuff- power, gas mileage, smoothness, etc
I also put in new NGK Iridiums and gapped them at .045, maybe that was the difference. Also, I've got every bolt on and I'm tuned with the Unichip, which could also make a difference. ???