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I have been reading about this on several other boards. The consensus is that they help by keeping the electrical system cleaner. The spark is more effective. They do not add anything. They reduce the effects of loss of current through poor grounding. Reports from people who have actually used them say they do not reduce any high power stereo loads or make the car feel any different. I would equate the using of these systems to getting bigger spark plug wires or a bigger gauge wire to ground the battery when installing a stereo. Helpful but probably not very noticable if you already have installed aftermarket plug wires. At their price ~$100 I don't think I will need them.
 
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