Originally Posted by
Herrsavage
Are NR C5TF plugs good for the F11?
No!! That is a cold body plug and mainly for onroad. C5TGC or C6TGC is what you want. If you try running that C5TGF plug your gona have flame outs and you will be chasing the tune all day. The last letter is what determines a hot or cold body plug. I know the first time I bought Nova plugs I assumed the C meant cold
C: caldo
F: frio