x440 s spark plug?

[B S]

what is the plug i need to get for my 2001 x440s ?



for some reason i had a new iridium wisker on me

[Canniboomer]

I've been using the NGK Iridiums for a decade now, with superb results. And to this day I cannot really say which is better suited, the 8 or the 9 ?
as that can vary by machine with fueling and other settings... or even the season I suppose. Either have been fine -- I would also be curious to hear other opinions by now