My daughter's '08 9-3 Aero V6 has about 25K miles on it but she has a failing coil. Unfortunately, it's not throwing a CEL yet but has all of the symptoms. She was just going to put all new coils and plugs in it. Personally, I'd just change the bad one but what do I know? Anyway, I've heard the was a change in spec for the plugs so what's the best choice?
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