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My 3.6 really did not like Iridium plugs with nitrous. I got one colder iridium and still didn't like it. Then I went with the Brisk Racing silver RR14YS which worked well up to 100. After 100 I switched to the colder non projected tip Brisk Racing Silver RR14S. You should def get copper or silver plugs for a nitrous system. I'm trying to find what compression the 2012 LFX has. Mine is 11.3:1 in my 2013 which made changing plugs necessary. Way too much KR on the stock Iridium plugs
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