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The 8.5 refers to insulation thickness. The conductor resistance needs to be within a certain range as listed in the repair manual. Too little resistance in the wires allows spark noise (electromagnetic radiation) that interferes with the electronic control modules and the nearby radio or cell phone. Unless you got a great deal on the wires the extra price is not warranted since the stock wire insulation is adequate in this case. Depending on what part of the country you are in winter temperatures will affect the output of the battery. A blanket over the engine, a heat lamp underneath, and trickle charge on the battery may be needed below 15 F. For now enjoy the benefits of the tune up and reduced weight. I no longer work in a NAPA auto parts store but we did sell high performance ignition components to drag racers.
Last edited by Grant-53; 10-15-2014 at 11:13 AM..
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