APR EA888.3/4/EA855.2/EA824 Iridium Pro Spark Plug – Heat Range 9 – 14mm x 26.5mm x 16mm – 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 9 spark plug (Similar: Bosch 3, Brisk 10, Denso 27, and NGK 9)
• 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
• Stronger than copper and platinum
• Perfect for upgraded APR vehicles
• Lower required supplied voltage
• Non-projected insulator design
• Thread diameter: 14mm
• Install Torque: 25 Nm
• Thread reach: 26.5mm
• Seat Type: Gasket
• Made in the EU
• Hexagon: 16mm