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 got a Ford, so I use Motorcraft. They work great.
Honesty I've just used Champion all year's or whatever less than five bucks and have never ever given me any issues.
Denso iridium are great for turbo cars
NGK are also good, but in experience denso iridium works better when running more than 1 bar of presseure
installed new plugs and R8 coils today no misfires anymore. this car is f'ing FAST now!
I dunno about coil packs but I put in Denso Iridium plugs a couple months ago and they have been working out just fine...
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
But otherwise, Bosch FLR8LDCU+.
God knows they can only be as bad as the Bosch plat +4's, Man those are terrible in basically everything I've put them in... good luck!
Had bad bosh plugs before.
Never had a issue with OEM ac-delco or Ford plugs/parts.
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