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• Revolutionary surface air gap firing technology featuring four yttrium-enhanced ground electrodes delivers the longest, most powerful spark for ultimate engine performance
• Electrode gap is factory set to provide ease of installation - never requires adjustment
• Never requires gapping, the electrode gap is factory-set and never requires adjustment

• Superior Anti-Fouling and Improved ignition
• Better center electrode anti-oxidation and anti-erosion
• More durability and a higher melting point than platinum

• Revolutionary surface air gap firing technology featuring Bosch's unique four ground electrode design delivers the most powerful spark for the most efficient combustion and optimum horsepower without increasing the voltage requirement
• Fused iridium and platinum center electrode, sintered into an extended insulator nose results in reaching self-cleaning temperature only seconds after starting and provides exceptional wear resistance
• Four yttrium enhanced ground electrodes resist spark plug wear and oxidation for exceptional performance life

• DiamondFire electrode technology that creates a superior spark and resulting flame front extending further into the cylinder, producing more localized pressure
• Significant potential power increase: > 6% to 12% (depending on engine class)
• Significant potential fuel efficiency improvement: > 4% to 13% (depending on engine class)

• Insulators constructed from 99 percent pure alumina silicate
• Constructed from durable material
• Corrugated ribs prevent flash over