Refresh your ignition system with the APR Iridium Pro Spark Plug, part number aprZ1003101. Designed for high-performance and tuned applications, this heat range 9 spark plug supports a stronger, more consistent spark in demanding conditions. Its optimized electrode design helps ignite challenging fuels, including ethanol, while the projected insulator design promotes dependable performance under heat and load. The cooler operating temperature and improved resistance to preignition make it a practical upgrade for stock vehicles, higher-boost setups, and upgraded APR applications.
The APR Iridium Pro Spark Plug is engineered to pair with APR ignition coils and requires less supplied voltage than many conventional plug designs. Its iridium construction offers greater strength and a higher melting point than copper, platinum, and silver, helping maintain reliable operation during spirited driving and elevated cylinder pressures. The plug uses a 14mm thread diameter, 19mm thread reach, gasket seat, and 16mm hexagon. Recommended installation torque is 25 Nm. Always verify the correct plug size, heat range, gap, and application specifications before installation.
This single APR spark plug fits select Audi applications, including the 2010 Audi A3, A4, A4 Quattro, A5 Quattro, A6 Quattro, S4, S5, and TT Quattro. Heat range 9 is comparable to Bosch 3, Brisk 10, Denso 27, and NGK 9. Made in the EU, the APR Iridium Pro Spark Plug is a direct-fit ignition upgrade for drivers seeking smoother idle quality, sharper throttle response, and consistent spark performance in demanding street, track, and modified vehicle applications.
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