recently put in some NGK BKR7Es and so far so good, gapped at .026" (or .027 i can't remember and im not taking them out to check )... ran it up to 20psi and it seemed to run harder
I use BKR7E .022, I change them every 3000 miles...until now no issues..and they are cheap
brk7e's are excellent...2.5 years with no issues on this particular plug(not the same set obviously). .025 is a good gap, alot run .028..but i have found. 025 to be better,especially for frequent WOT driving in the heat here.
first set i used were NGK R5671A-7 non-resistor plugs gapped at .025\" had ran multiple sets of these for well over 20k miles with zero issues.
I have now used those plugs of mine up to 35psi so far with no issues.
Same exact plugs I use they haven't given me any issues I have em gapped to .022 and no misfires at 31psi, the car made over 600whp with no problems with these plugs, and they cost about $3 a plug.
DCPR8E NGK copper. we use stock gap and change every 10k-15K miles. So far so good for me. 12psi fyi.
I still use stock gap on my DCPR9EIX on my turbo R with no missfires.
I'm flashed with Revo Stage 1 and I run NGK BKR7E plugs gapped to 0.028\". They are 1 range colder and are cheap ($15 for 4 at Lordco if you have a discount). Only downside is that you should regap them every oil change, and change them ever other oil change
I just did mine not too long ago and bought the NGK's @ Advanced but they claimed that it had to be gapped @ 0.032 but when I took the old ones out, the bosch we gapped @ 0.030. I put the new ones in and you can feel it not running as smooth but I've been too lazy to find some gapped @ 0.030.
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