E3 Spark Plugs

05-10 Chrysler 300C /  Dodge Challenger / Charger / Magnum 5.7L Hemi & 6.1L SRT8

E3.66

The E3.66 Spark Plug is engineered for superior combustion efficiency and long-lasting performance, making it an ideal upgrade for your vehicle engines. Featuring E3’s patented DiamondFIRE technology, the plug delivers enhanced power, better throttle response, improved fuel economy, and reduced emissions. The three-legged ground electrode secures the plug’s DiamondFIRE tip to the shell, maximizing turbulence and heat transfer within the combustion chamber. Built with a fixed gap for consistency and a nickel-plated shell to resist corrosion, the E3.66 is made to last for 5 years or 100,000 miles—whichever comes first.

• Patented DiamondFIRE Technology: Enhances flame kernel propagation, resulting in increased power and fuel efficiency.
• Triple Ground Electrode Design: Ensures excellent heat dissipation and stability under extreme engine conditions.
• Fixed Gap Design: Precision pre-set for optimal performance; no gapping required.
• Longevity & Durability: Rated for up to 100,000 miles or 5 years of dependable use.
• Improved Emissions: Helps reduce hydrocarbon emissions for cleaner engine operation.
• High-Quality Construction: 14mm thread diameter, 1.000" reach, 5/8" hex size, and corrosion-resistant shell with a taper seat.

E3 Spark Plugs uses its patented DiamondFIRE design to target efficient combustion and consistent ignition performance across automotive and racing applications. For performance builds, a quality spark plug choice can support clean burn characteristics and reliability—especially when tuning for higher cylinder pressures or more demanding driving conditions.