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  1. M

    Spark plug recommendation

    Have an 07 Ironman 4.6, with just over 70k, what spark plug is best? Purchased Dec. 2012, assuming original plugs are still in. Have installed K&N CAI, & Magnaflow catback. Only getting 13 city / 17 hwy. Will probably upgrade to ACCEL coils. (New member, 1st thread)
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