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  1. Which spark plugs for best performance/mpg efficiency?

    thank you

  2. Which spark plugs for best performance/mpg efficiency?

    thank you!

  3. Which spark plugs for best performance/mpg efficiency?

    Just installed JB4 tuner and was wondering which spark plugs/gap for best results? Which spark plugs are you guys using for best performance/mpg efficiency?

  4. Which spark plugs for best performance/mpg efficiency?

    Wondering which spark plugs/gap is best when running jb4? Which spark plugs are giving best mpg?


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