forcd ind

iTrader: (7)

i know this has been beat to death, but when i look up the ngk chart, after the tr6 plug it goes into a diff # system, and the plug is hard to find-i dyno'ed with the tr6, and would like to know im getting a plug 1 step colder
i used a x'ed ref chart, but in another brand, it showed several diff plugs for the same ngk one!!!!!!!
thanks

onfire

iTrader: (17)

bp7efs stock #3526. I ran that plug to the low 9's without a problem.