Subaru Impreza Outback 22401-AA720 Iridium Spark Plug SILFR6A-11 Replacement

Is your Subaru Impreza or Outback experiencing rough idle, weak acceleration, cold-start difficulties, or noticeably higher fuel consumption? These symptoms typically indicate worn spark plug electrodes or heavy carbon buildup, leading to unstable ignition. Normal operation relies on spark plugs to ignite the air-fuel mixture for smooth power delivery. This product OEM number is 22401-AA720 / SILFR6A-11, suitable for Subaru Impreza, Outback, Legacy from 2000-2010. Use a torque wrench to tighten to the specified torque (about 20-25 Nm) to avoid overtightening and damaging cylinder head threads or under-tightening leading to leaks.