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I had them on the car for about 2 months before the transmission broke. However, I also used to have one of the spark exciter modules, but it had gone bad. So, I really didn't notice any difference. IMHO, I think some of their claims would be seen always when switching from old coils to brand new ones. Since I run boost, with both stock and ZZP, I have to gap the plugs at 0.028 (whereas with the module I could run stock 0.035).
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Jack Bilger
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