With the new found problems with the OEM F5DPOR spark plugs which are specified as OEM for the 1992-1995 audi S4/S6 we needed good high performance alternatives to the stock plugs. These copper core NGK plugs have been dyno tested to 700whp. gap to .020" for the s4/s6 AAN / 3B engine. We also use these on most other boosted audis like the 1.8 and 2.7t's.
Heat range 9.