APR EA825/EA839/9A2 Iridium Pro Spark Plug - Heat Range 10 - 12mm x 26.5mm x 14mm - SINGLE

Refresh your ignition system in one shot with APR Iridium Pro Spark Plugs and pair with APR Ignition Coils – engineered to work together for a stronger, more consistent spark. Each is a direct-fit upgrade designed to support smoother idle, sharper throttle response, and reliable performance under heat and load—whether you’re stock or running higher boost and power upgrades. 12X26.5X14mm - Heat Range 10 Always check sizes, gap, and heat range specs before installing. Installation of the wrong length plug can cause damage to the engine. You must verify this before installing the plug.

• 152% higher melting point than silver, 125% higher than copper, and 38% higher than platinum.
• Heat range 10 spark plug (Similar: Bosch 2, Brisk 8, Denso 31, and NGK 10)
• 1 step colder older than OEM (2.9T/3.0T EA829, 2.0T/2.5T/3.0T/3.7T 9A2)
• Optimized electrode design for hard to ignite fuels, such as ethanol
• Designed for high performance / tuned vehicle applications
• Cooler operating temperature than stock plugs
• Resists preignition better than stock plugs
• An excellent match for APR ignition coils
• 2 steps colder than OEM (4.0T EA825)
• Stronger than copper and platinum
• Perfect for upgraded APR vehicles
• Lower required supplied voltage
• Non-projected insulator design
• Supplied Gap: .55mm +- .05mm
• Insulator Material: Ceramic
• Thread diameter: 12mm
• Install Torque: 17 Nm
• Thread reach: 26.5mm
• Seat Type: Gasket
• Made in the EU
• Hexagon: 14mm