Best Spark plug for Audi S4

Heat Exchanger, also Brisk racing spark plugs I gapped mine to 0.026”.

Since I've owned my 18 S4 i've done almost everything myself:

4 oil changes, spark plugs at 40k, 2 sets of pads and 1 set of rotors, both air filters.

I don't cheap out on the car so everything i put most by a name brand. New Parts; 37. NGK Spark Plugs

The Bosch side fires are an AAN plug that has a removable top. I will probably use those, they worked great with my B5 S4.

Anyways, I put in so Bosch Tri-Electrodes and Beru coilpacks. Once I got the APR ECU back the car fired right up. I drove it for a good hour and no misfires!!!

I recently took my stage 2 43K mile b8.5 s4 apart and did the PCV, water pump, thermostat, new 2 step colder brisk spark plugs gapped to .25. I took the spark plugs out and noticed heavy carbon and the ground electrode was white, even on all plugs . (20 miles on plugs)