APR - aprZ1004081 - EA825/EA839/9A2 Iridium Pro Spark Plug, Heat Range 10

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

Refresh your ignition system with the APR Iridium Pro Spark Plug, designed for high-performance and tuned vehicle applications. This heat range 10 plug features an optimized electrode design for hard-to-ignite fuels such as ethanol and operates at a cooler temperature than stock plugs. Its iridium construction offers a 152% higher melting point than silver, 125% higher than copper, and 38% higher than platinum.

The APR Iridium Pro Spark Plug is supplied with a 0.55 mm gap plus or minus 0.05 mm and uses a non-projected insulator with a ceramic insulator material and gasket seat. It is described as one step colder than OEM for 2.9T/3.0T EA829 and 2.0T/2.5T/3.0T/3.7T 9A2 applications, and two steps colder than OEM for 4.0T EA825 applications. It is also designed as an excellent match for APR ignition coils.

Key Features & Performance Benefits

• Iridium Construction: Provides a higher melting point than silver, copper, and platinum.
• High-Performance Design: Intended for high-performance and tuned vehicle applications.
• Optimized Electrode: Supports ignition of hard-to-ignite fuels such as ethanol.
• Cooler Operation: Runs cooler than stock plugs and resists preignition better than stock plugs.

Key Product Specifications & Technical Data

• Brand: APR
• Part Number: aprZ1004081
• Heat Range: 10
• Thread Diameter: 12 mm
• Thread Reach: 26.5 mm
• Hexagon: 14 mm
• Supplied Gap: 0.55 mm plus or minus 0.05 mm
• Install Torque: 17 Nm

What's Included

One APR Iridium Pro Spark Plug. Fitment includes 2.9T/3.0T EA829, 2.0T/2.5T/3.0T/3.7T 9A2, and 4.0T EA825 applications as stated by the product data. Always verify plug size, gap, heat range, and required length before installation; installing the wrong-length plug can cause engine damage.

Air Freight Prohibited: false
Not Carb Approved: false
Carb Acknowledgement Required: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Units Per Sku: 1
Regular Stock: t