WARNING: This product can expose you to chemicals that are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.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.
Technical Specifications:
| Specification | Details |
|---|---|
| Heat Range | 9 (Comparable to NGK 9 / Denso 27) |
| Thread Reach / Diameter | 26.5mm / 14mm |
| Hex Size | 16mm |
| Seat Type | Gasket |
| Installation Torque | 25 Nm |
Cross-Reference Heat Ranges:
- Bosch: 3
- NGK: 9
- Denso: 27
- Brisk: 10
Critical Safety Note: Always verify thread length, diameter, and proper gap requirements for your specific engine before installation. Installing a plug with the incorrect reach can lead to catastrophic internal engine damage.
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