APR Iridium Pro Spark Plug EA888.3/4/EA855.2/EA824 - Heat Range 9, 14mm Thread, 26.5mm Reach

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. 14X26.5X16MM - Heat Range 9 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 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

Upgrade your vehicle's ignition system with the APR EA888.3/4/EA855.2/EA824 Iridium Pro Spark Plug, engineered for high-performance applications and reliable, consistent sparks. Designed to support smoother idling, sharper throttle response, and enhanced performance under heat and load conditions, this spark plug is ideal for both stock setups and vehicles with higher boost or power modifications. Its durable construction and optimized electrode design ensure optimal ignition even with challenging fuels like ethanol, making it a perfect match for APR upgraded vehicles.
Manufactured in the EU, this spark plug features a thread diameter of 14mm, a thread reach of 26.5mm, and a gasket seat type, providing a secure fit for a wide range of high-performance engines. The non-projected insulator design helps improve ignition efficiency, while the cooler operating temperature and resistance to pre-ignition give added reliability during demanding driving conditions. The spark plug’s design also supports lower voltage requirements, reducing stress on your vehicle’s ignition system. Proper installation torque of 25 Nm ensures optimal performance and safety, and the 16mm hexagon design allows for easy installation and removal.
Whether you're upgrading your vehicle for racing, tuning, or everyday performance, the APR Iridium Pro Spark Plug offers superior durability and efficiency. It provides a significant upgrade over standard copper or platinum plugs with its 152% higher melting point, ensuring longevity and resistance to extreme heat. Compatible with APR ignition coils, this spark plug is an excellent choice for enthusiasts seeking to maximize engine responsiveness and reliability in high-stress driving conditions. Regular maintenance and proper size and gap verification are recommended to ensure optimal operation and engine health.

Features:

• High-performance Iridium construction with a 152% higher melting point than silver

• Heat range 9 spark plug designed for demanding applications

• Optimized electrode for igniting challenging fuels like ethanol

• Cooler operating temperature compared to stock plugs

• Resists pre-ignition, improving engine stability

• Perfect match for APR ignition coils

• Lower voltage requirement for efficient ignition

• Non-projected insulator design for better spark delivery

• Secure gasket seat type for reliable sealing

• Easy installation with 16mm hexagon and specified torque

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
Regular Stock: t
Units Per Sku: 1