Product Description: The Brisk Racing DR12S spark plugs are high performance spark plugs that are ideal for cars with performance software upgrades and/or turbocharger upgrade kits running increased boost pressure. These long-life silver spark plugs will outperform the factory spark plugs and are a recommended performance upgrade for a Stage 2 EA113 & EA888 Gen 1 or Stock & Stage 1 B8/B8.5 AUDI S4/S5 & Q5/SQ5 3.0 TFSI, as well as other high performance Audi and VW setups. Silver spark plug electrodes transfer electricity & heat better than any other spark plug material resulting in consistent peak spark performance required to propagate efficient combustion! This is beneficial for a full complete combustion of the available fuel and air in the combustion chamber, combustion efficiency creates horsepower gains. Replaces Part Number: 06H 905 601A 101 905 611G Features: Superior Ignition Ability Increases Engine Power allowing detonation resistance in high power applications Cooler heat range for some applications allowing detonation resistance in high power applications Lower Required Supplied Ignition Voltage Good Resistance to Fouling and Easier Starts 1.5 mm Silver Fine Wire Center Electrode Low ignition voltage requirements (easier for spark to jump over) Reduces stress and wear on your coil and other ignition components Fires properly even if partially fouled, where standard plugs will fail Specifications: Thread Size: 14mm Reach: 19mm - 3/4in Hex Size: 16mm-5/8in Seat Type: Gasket Design: Silver Center Electrode Resistor: Yes Projected: No Applications: OEM+ Replacement: Stock to Stage 1 Audi B8/8.5 S4/5 Stock to Stage 1 Audi C7 A6/A7 3.0t Upgrades - These plugs are one step colder versus OEM - one step colder is typically recommended for Stage 2 tunes and higher: Stage 2 Audi B8/8.5 A4/A5 2.0t Stage 2 Volkswagen GTI/R MkVI Stage 2 & 2+ Volkswagen GTI MkV Stage 2 & 2+ Audi 8J TT/TTS Vintage 5-Cylinder (AAN/3B/7A) - ~above 350hp but below 500 5V 1.8t - ~above 300hp but below 450 2.7tt - ~above 400hp but below 550 NOTE: Apply a thin coating of high temperature anti-seize to the threads prior to installation to avoid corrosion on the threads of the spark plug and/or head.