Mine are either ACDelco or NGK, cant remember which. Either way no complaints.
I went ahead and replaced all 4 coil packs and plugs as well as the PCV valve. Since I have to order parts, it seemed faster than checking the plugs and swapping coil packs, as well as good insurance, since the coil packs and PCV valve were (over)due for replacement anyway. It took about an hour without rushing. Took about a 30-minute test drive, highway and town, and the engine's running smoothly. Ran a scan when I got home, and no new fault codes, so I cleared them all out and the check engine light went out.
When I had dino burner cars, I did all of my own work, and always used Bosch Platinum plugs for my specific engine and heat. Iridium last the longest life, but are more sensitive to getting hot and causing pinging.
I have always used double plat or ngk laser iridium with no issues in my 2.5.
I ran stock plugs for a while and they got chewed up fast. On NGks now and even pushing 29 psi they keep the gap well.
I run the IS38 FBO and beat the crap out of my car and use stock heat-range Rutheniums.
Spark plugs. NGK 4 lyfe
Bosch spark plugs aren't bad, per se, but they're not really anything special.
I'm Stage 2+ with r8 coil packs and ngk BKR7EIX and still get misfires. I'm not happy about it and I'm not sure what to do.
In my experience, Bosch spark plugs are always terrible; fouling out within a month, that kind of thing...
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