My plugs were first changed by the Dealer at 41k miles right before I bought my car. I installed my cobb within 5k miles upon purchase, and quickly went to stage 2+ after only a month or so at stage 1. Currently I have 71K miles and I easily have over 20k miles running ~40% e85 mixed with CA 91 octane. I never had a single misfire, but have PTF making a custom tune for me and felt like changing the plugs seeing as they had so many miles on them. For new plugs I went with the NGK 5992 ILZKBR7A-8G PTF recommends and so far so good. Car fired right up and pulls hard to redline. I need to take some logs and send them in to Jake so we can finish my Protune. The NGK 5992's were very easy to gap, and was my first time ever having to gap a spark plug. The only thing I forgot was I don't own a torque wrench so I wasn't able to torque the new plugs to the 17ft lbs your supposed to. So tomorrow I'll be buying a wrench needless to say. Old plugs look pretty good to me. Plugs from left to right are 6,5,4,3,2,1
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