APR Iridium Pro Spark Plug - EA825/EA839/9A2 (Heat Range 10, Single)

On modified or high-performance Audi and VW engines running the EA825, EA839, or 9A2 engine family, the OEM plug's heat range can become a limiting factor well before the scheduled service interval — particularly on builds running elevated boost or ignition advance beyond factory parameters. APR's Iridium Pro spark plug is spec'd at Heat Range 10 for these platforms, providing the correct thermal dissipation for modified applications where a warmer stock plug would risk pre-ignition.

The iridium electrode maintains a fine tip geometry for reliable, consistent ignition through thousands of heat cycles, resisting the electrode erosion that degrades spark quality and combustion efficiency on conventional plugs under high-load use. Heat Range 10 runs cooler than many OEM-spec plugs, appropriate for built engines where managing combustion chamber temperature is critical. Sold as a single plug — order quantity to your cylinder count.