Brisk DOR14LGS-T spark plugs
 

You have to switch to these plugs ASAP. I have a stage 2+ B5 S4 that has always been finicky over spark plugs and gaps - a lot of the gap issues were because my coils were old and especially suffered on higher rpm. I did do an ICM bypass and went to RS6 coils and that was a huge improvement as I could go back to regular gap sizes. Then I tried Brisk Silver electrode (standard electrode configuration) and was very impressed over the copper NGKs I was using. I just thought I would try the multi-electrode LGS plugs - same as used in Lamborghinis. WOW - what a difference! Especially at lower rpm - no more misfires and lumpy idle. Pulls harder at lower an higher speeds. All around improvement and you can get at JEGS for 10.99 each. I was going through copper NGK BRK7Es ever 3,000 miles or so. The regular Brisks I have gone over 5,000 and when I pulled them they looked hardly used. Silver conducts better than cooper as well but the main difference is the spark becomes sort of a plasma as multiple electrode paths are created.
Brisk USA DOR14LGS-T: Premium Racing Spark Plug Thread: 14mm | JEGS