Been using the ngk ones for 10K km so far and they work just like oem, no problems, no misfires.
The racing plugs from NGK are exceptionally expensive, their standard Iridium plug is great as well. I wouldn't spend the money on the racing plug... I've tracked my car with the standard Iridium plug extensively and had no issues with plug wear etc. I personally feel that the racing plug is just taking more money out of your pocket for no gain/return.
I currently have them installed and gapped at .025. I don't know if they're making a difference or not but the car is running great so I haven't bothered switching back to stock.
I just switched out a set of Bosch's for the NGK PFR7S8EG's...and to me it's night and day.
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.
I had NGK PFR6Q and it ran fine. But... now I use the stock NGK plugs
I went with some NGK coppers. I dont know the exact part numbers of them but the ones I got were crap lol My MPG went down to 19 mpg.
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