APR 4.0T EA824 Spark Plugs (8)

APR IRIDIUM PRO SPARK PLUGS - 14MM X 26.5MM X 16MM - HEAT RANGE 9 FOR AUDI VW PORSCHE | Z1003100 The APR Iridium Pro Spark Plugs (Z1003100) are a high-performance ignition upgrade specifically engineered for tuned and high-output Audi, VW, and Porsche engines. When increasing boost and cylinder pressure through ECU tuning, factory spark plugs can become a weak link. APR’s Iridium Pro plugs utilize Iridium—one of the strongest materials available—offering a melting point 152% higher than silver and 38% higher than platinum. This resilience allows the plugs to withstand the extreme thermal loads found in Stage 2+ and ethanol-fueled (E85) applications. Featuring a Heat Range 9 (colder than stock), these plugs effectively dissipate heat to prevent pre-ignition and knock. The non-projected insulator design and copper core further enhance thermal management, while the optimized electrode requires lower voltage to produce a consistent, powerful spark. These are the ideal companion for high-boost setups and pair perfectly with APR Ignition Coils for a complete ignition system overhaul. Features: Superior Durability: Iridium construction is significantly stronger than copper or platinum, resisting melting and cracking under high cylinder pressures. Heat Range 9: Optimized for tuned engines, running cooler than factory plugs to prevent power-robbing pre-ignition. High-Performance Design: Non-projected insulator design specifically tailored for high-output and motorsport applications. Ethanol Ready: Optimized electrode design ensures reliable ignition even with hard-to-ignite fuels like E85. Efficient Ignition: Requires lower supplied voltage to create a strong spark, reducing strain on the ignition coils. Thermal Management: Integrated copper core dissipates heat rapidly to protect the electrode from thermal fatigue Replacing the following part numbers. If you would like to order in different quantities than 8 send a message. 06K905601B 06K905601D 06K905601K 06K905601M 06Q905601E 06Q905601L