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Well we are using zex plugs and have had no faults, The car performs and dyno's the same numbers n/a, and on the spray has no problems, though we are only at a 50 shot. This ve puts down 210 whp n/a . Just our results, we also use them our turbo cars. I used to use ngk cold plugs and the car rand like crap and would not last long before it would start to misfire.
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13.9 1/4 102 mph 2710pounds 201 whp
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