Thumper
Autocross Champion
Seriously. I was floored that over ~20k miles my gap went from .32 to about .50… or to .70 on the bad, broken plug. I think I’ll just make this a thing that I do every 10k miles.
I don’t recall the exact part number but I also run (OEM listed on FCP) NGKs.
Yeah, I change my plugs every year which is way fewer than 10k miles now but track duty is hard. I'm already in there doing my cam follower every season so why not swap plugs while the hood is up. LOL
Buy them from FCP, free replacement and easy 20 minute job (I have to pull my intake rear section to access).