Anyone running NGK PFR 7B's?

[Tifun]

Anyone using these in their S4's????? Are you chipped, stg3 or stock? Thanks,

[MacDaddy]

i'm curious too, and how they run on a stock S4

[ThirdStrike]

im stage 3 on 42 lb injectors and i run a 7 series plug from ngk.
they are bkr's (iridium) but its the same heat range.
when i installed them they were pre-gapped to .28. car ran fine until i hit 10psi. then instant misfires all over the place. took them out and closed the gap to .25 and they run like a champ.
bkr6eix's are stock heat range so anything colder and you will need a smaller gap.
next time around im going to try a bkr8 .. coooollld!