APR EA825/EA839/9A2 Iridium Pro Spark Plug - Heat Range 10 - 12mm x 26.5mm x 14mm - SINGLE (aprZ1004081)

This is the APR EA825/EA839/9A2 Iridium Pro Spark Plug - Heat Range 10 - 12mm x 26.5mm x 14mm - SINGLE. Part aprZ1004081. Ignition parts (coils, plugs and wires) deliver a strong, consistent spark.

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 and benefits

• Heat range 10 spark plug (Similar: Bosch 2, Brisk 8, Denso 31, and NGK 10)
• 152% higher melting point than silver, 125% higher than copper, and 38% higher than platinum.
• Stronger than copper and platinum
• Designed for high performance / tuned vehicle applications
• Non-projected insulator design
• Lower required supplied voltage
• Cooler operating temperature than stock plugs
• Optimized electrode design for hard to ignite fuels, such as ethanol
• Resists preignition better than stock plugs
• Perfect for upgraded APR vehicles

Product details

• Part type: Ignition
• Brand: APR
• Center Electrode Tip Material: Iridium
• Grade Type: Performance
• Indexed: No
• Insulator Material: Ceramic
• APR part number: aprZ1004081

Fitment

• Vehicle: Audi RS4 / RS5, Audi RS6 / RS7, Audi S4 / S5, Audi S6 / S7, Porsche 718 Cayman/Boxster, Porsche 911 (992)
• Years and trims on file: 2018-2019 Audi RS5 Base; 2021-2024 Audi RS5 Base; 2019 Audi RS5 Sportback Base; 2021-2025 Audi RS5 Sportback Base; 2021-2023 Audi RS6 Avant Base; 2025 Audi RS6 Avant GT; 2024-2026 Audi RS6 Avant Performance; 2021-2023 Audi RS7 Sportback Base; 2024-2026 Audi RS7 Sportback Performance; 2019-2025 Audi S4 Premium; 2018-2025 Audi S4 Premium Plus; 2018-2025 Audi S4 Prestige; plus 39 more on file
• Application listing: APR EA825/EA839/9A2 Iridium Pro Spark Plug - Heat Range 10 - 12mm x 26.5mm x 14mm - SINGLE
• Check the vehicle, model years, engine and trim above against your car before ordering. Not sure? Ask us and we will check it against your VIN.

Shipping & returns

• Orders are processed within 1–3 business days; standard delivery is 3–7 business days within the United States.
• APR parts are supplied through our distributor. We confirm availability and lead time with you after you order.
• We currently ship within the U.S. only. See our Shipping Policy.
• 30-day returns on unused parts in original packaging — see our Return Policy.

Installation at Team ANBD

Team ANBD is a performance shop in Andover, New Jersey. We can align or corner-balance the car, and prep track cars. Book an appointment or ask us about installation and fitment before you order.