I ran those plugs with zero issues for many years on my stage 2+ car gapped at .028.
PFR6Q was equivalent to the stock Bosch plugs. They work fine.
I used NGK BKR5E-7938 they are awesome plugs, i only paid $14 for mine but i have a friend who pays cost. they are around $80.
I used to run NGK tr55's in my mach1 but for some odd reason they had a tendency to become loose I thought it was my heads but I switched to a brisk plug over 30k ago and haven't looked back I will be buying them for all my cars.
installed new plugs and R8 coils today no misfires anymore. this car is f'ing FAST now!
just did my coil packs and plugs. Used E version Hitachi Made in Japan coils. to my surprise the NGK Laser Cut Platinum plugs PFR6Q came gapped at .028, I was expecting them to be set at .032 from the factory, so it was a simple replacement. No more misfires over 20 psi
Bosch W7DTC plugs were the best, caint get them no mores, use NGK BP6ET plugs instead.
New NGK Spark Plugs
I am getting better MPG,but It seems a little lacking in the power dept. compared to the autolite copper I had in?!Especially as far as low end torque.
Me and another both ran BKR6E coppers for a week until the misfires threw a CEL. Logging the misfire counter, I was constantly getting misifres @ idle. I don't think copper is appropiate at all.
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