NO, unless you go turbo, high compression, or other major engie mods, you don't need them and your better off spending money on motor oil. I have magnecore which have low resistance and def. thicker wires but also upgraded ignition, so i need the upgraded wires. Other wise on stock car with just i/h/e etc, go with iridium spark plugs, that will get you some hp for sure for about the same price.