Use only the recommended four-electrode type plugs made by NGK. There are no substitutes, regardless of what the rookie at Napa, Canadian tire or most other retail auto parts suppliers would have you believe. The ones you need are the NGK BR8EQ14 (1st gen cars) or combination of BR8EQ or BR7EQ or BR9EQ depending on which generation, turbo or non-turbo, etc. you have.

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Rotor Head