If you thought there was only one spark plug player in town it’s time to broaden your scope. Autolite Xtreme spark plugs have a full iridium tip on the center electrode that delivers precise firing with virtually no gap erosion. In addition, the Xtreme plugs have a trimmed side electrode that further aids in confining and condensing the spark to create a sharper, brighter burst. Combining these features gives added performance with extended life, while the copper core aids in cooling and improves resistance to fouling.