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.

Features:

• 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