A spark plug is a spark plug, right? It is such a small part of your Mercury Zephyr, how much of a difference can it really make what kind you use? Well, it is like the difference between Bruce Banner and the Incredible Hulk. A stock spark plug is wimpy and calm, while Mercury Zephyr spark plugs from AutoAnything are tough and powerful.
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Every little Mercury Zephyr spark plug has its own built in capacitor. This electrifies your spark for more efficient combustion which increases your torque, pumps up your horsepower and speeds up your throttle response!