These Denso IKH01-24 spark plugs are ideal for cars with performance software upgrades and/or turbocharger upgrade kits running increased boost pressure. These long-life iridium spark plugs will outlast and outperform the factory spark plugs. These spark plugs are a recommended performance upgrade for the Audi 8S TTRS & 8V.5 RS3 2.5 TFSI ignition system, and replace part number 06K 905 601 M.