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. BUILT FOR PERFORMANCE: APR Iridium Pro Spark Plugs are made from high-grade materials, engineered to enhance ignition and combustion, and provide smooth, consistent engine power for daily drivers, dedicated racing enthusiasts, and everyone in between. A DIRECT-FIT UPGRADE: Upgrade your OEM spark plug on stock vehicles and on tuned engines with higher boost or upgraded power components, APR spark plugs are engineered to manage increased demands. Direct replacement for OEM stock parts 06K905601B/D/K/M and 06Q905601E/L. IRIDIUM BENEFITS: One of the strongest materials used for spark plugs, Iridium is used to withstand high temps, is less corrosive, requires less voltage to product a strong spark, and helps deliver reliable power. HIGH-TEMP DURABILITY (HEAT RANGE 9): Featuring a copper core construction paired with an iridium electrode, APR’s high heat dispersal “cold plugs” regulate combustion temperatures. This means consistent performance, even under extreme conditions. COMPATIBILITY: Compatible with Audi A3 A4 A5 Q3 Q5 Q7 RS RS3 S3 S6 S7 TT TTRS TTS, VW Arteon Atlas Beetle Golf R GTI Jetta Passat Tiguan, Porsche Macan. MORE POWER WITH APR: Pair APR spark plugs with APR ignition coils for maximized performance in your MQB & MLB engines. Z1003100 works with Ignition Coil Part Numbers MS100192, MS100203, MS100204 MS100219, and MS100247. TRUSTED IN THE U.S. FOR OVER 25 YEARS: Founded in 1997, APR is Headquartered in Opelika, Alabama and has become a global leader in quality and reliable performance aftermarket products for Volkswagen, Audi, Porsche, and other vehicles. Includes: One iridium spark plug (Z1003100).