I use NGK's, and they seem to do just fine.
Oil change every 5-7k miles Mobile 1 European Formula (0w-40) Seafoam every 5-6 months New NGK Laser Platinums Plugs (500mi ago) 1 new coil
I run the DCPR8EIX and they are great. No need for 9's for me.
NGK are a good spark plug brand.
NGK plugs have never failed me at my shop. I'm pretty sure they're NGK 3199 plugs
i changed the plugs out for oem replacement NGK plugs (it had bosch platimun +2 in it) and a set of wires. and it ran just fine it was fixed. i then decided to swap my other coilpack back in and it ran fine no issues at all.
I put in NGK PFR7B plugs and R8 coil packs. Smoothed the idle out and judging by the butt dyno the rev/boost response seems great.
I run stock NGK with .026 gap as well and I've been anywhere from 10-18psi
I have tested the BCPR7EIX which did not make any difference to my car. I felt that the standard plugs worked well vs these.
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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