PFR7Q. Hella expensive, but they last for 2 years and give absolutely no trouble.
i use bkr7e in my AWW 1.8t chipped, they work great
replacing the finally worn out NGK PF6Q (stock plugs @ $75.00) that last forever (about 4-5 years, cleaned/re-gapped once)...
Ive used denso iridium and now use ngk iridium. Both have worked very well and last an eternity....as long as the car is properly tuned. A lil more expensive but you dont have to touched them as often as copper plugs.
I have always used the denso iridiums for big turbo use. They are a bit cooler then the BKR7E, and they last forever, no fiddling around with plugs. I even have had the head off the car and left the same damn plugs in it lol. Ya, they are more expensive, but I like the convenience of just never touching them.
ive been using NGK plugs in everything from my motorcycles, to cars, to outboard motors, whatever.. ive never had a problem with them.
BKR7E at .028 on a 2871R. I change them every oil change so basically ever 3k miles. For 9 bucks you can't go wrong. It's like instant power back. I have noticed though sometimes when I change them that the gap has opened up.
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'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 got some NGK DCPR8EIX's and gapped them to .022" and took them for a drive and they were fine. Then this morning on the way to work I did a 2-3 gear pull and got some misfires after my 2-3 shift.
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