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bosch spark plug

  1. Bosch spark plugs

    Forced Induction & Nitrous
    (Bosch) spark plugs noise reduction At the moment i use the denso ik20 in my 1zz fe turbo (gt28rs at 10 psi) I want for the summer 1 step colder. I can Go for the ik22. But what About this ones: Gap 0.7 mm vs...