Autolite® Xtreme Sport® spark plugs are engineered to meet or exceed OE designs and withstand the extreme operating temperatures experienced during your engine’s combustion. They were designed with iridium-enhanced 0.6mm finewire, and patented platinum sidewire technology for improved ignitability, faster fuel combustion and a more focused ignition versus standard plugs. They also provide up to 26 percent quicker starts compared to that of standard plugs and as much as 21 percent less hydrocarbon emissions than standard plugs, which promotes better fuel efficiency and horsepower. Throttle response is also improved over conventional plugs as well as durability. These plugs are great value and a few $$ less than other leading brands.