One of the biggest benefits to aftermarket Focus ST spark plugs is that they typically run in colder heat ranges than the factory plugs. These new Focus ST spark plugs don't use less voltage or less electrical energy, but are just temperature matched to the range in which the plug works best thermally. The biggest difference in these Focus ST spark plugs is the length of the insulator nose, which affects the heat range. Longer insulator noses allows the plugs to remain hotter, while a more exposed surface area on the plug allows for easier heating. For colder Focus ST spark plugs, the opposite occurs, which helps with performance when other aftermarket parts are installed.

Another option for Focus ST spark plugs is the type of material they're made from. One of the most durable materials for Focus ST spark plugs is iridium alloy, which has an extremely high melting point and is very resistant to corrosion. For high performance vehicles like your Focus ST, especially those with modifications already, these durable and powerful Focus ST spark plugs are a no-brainer. Order yours from CJ Pony Parts today!