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Why are you going one step colder? Are you having break up issues? I asked AMS about this awhile ago. They say they use stock IX plugs for all there IX builds builds
I'm not sure if this is where I'm suppose to post this question so if its in the wrong section... sorry . Anybody know where I can purchase one step colder NGK plugs for the Evo IX at a decent price I can't believe how much they cost. Freaking outrageous if you ask me.