Standard spark plug by Bosch. This spark plug matches the heat rating and design of the original spark plug.Unlike NGK spark plug B8HS or Bosch WR4AC, the W4AC is not shielded. This has no effect on the function of the spark plug or the engine. However, possible malfunctions may occur in electronic add-on components such as digital tachometers or the sort, provided that they are installed on the vehicle.
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