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
New NGK Spark Plugs
I'd replace them immediately, you'll notice an improvement right away.
You will have improved power and fuel efficiency if you replace those plugs.
It was the plugs all along. No wonder though, since they were extremely overdue for replacement. Checked the gap on every one i pulled out. They ranged from .037 to .048... so there must have been some severe blowby, hence the misfiring under boost.
Autolite 4162's, I changed them out every 1000 miles.
Don't go with Autolite XP iridium. I had on my Jetta and one of the tips basically melted after 25k. They suck.
The NGK's listed have a colder heat range. Great in the summer, it will misfire like crazy in the winter
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