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ALL SPARK PLUGS MADE TODAY HAVE A RESISTANCE GAP BUILT INSIDE THE PLUG, MANDATED BY THE EPA, ORDERED BY THE FEDERAL GOVERNMENT. SOLID COPPER WIRES CREATE MORE RESISTANCE WHICH IS WHY THE SPARK PLUGS FOUL OR THE ENGINE MISSES.
DENNY'S OWN HIGH-PERFORMANCE 8mm BLACK SPARK PLUG WIRE HAS A CARBON IMPREGNATED FIBERGLASS CENTER CORE WITH SPIRAL-WOUND STAINLESS STEEL ALLOY TO DELIVER THE HOTTEST SPARK & HIGHEST VOLTAGE POSSIBLE TO THE SPARK PLUGS. 400 OHM PER FOOT RESISTANCE, 600 DEGREES FARENHEIT PURE SILICONE OUTER JACKET PROTECTS AGAINST HEAT, FUEL, OIL & MOISTURE. STAINLESS STEEL SNAP LOCK TERMINALS AND HEAVY-DUTY 500 DEGREE SILICONE BOOTS.
LIFETIME GUARANTEE TO ORIGINAL PURCHASER.