Subaru Legacy Outback 22401-AA731 Iridium Spark Plug SIFR6A-11 Factory Direct Supply

When your Subaru Outback or Forester experiences idle instability, hesitation on acceleration, cold-start difficulty, or obviously increased fuel consumption, this usually indicates the original spark plugs are aged or electrodes worn and need timely replacement. This iridium spark plug precisely ignites the combustible mixture during normal operation, ensuring smooth power output and thorough combustion, thereby improving fuel economy and reducing emissions. Compatible with Subaru Legacy, Outback and other post-2000 models; OEM numbers are 22401-AA731 and SIFR6A-11. Install with a torque wrench to the manufacturer’s specified torque to avoid over-tightening that could damage the cylinder head threads or under-tightening that could cause leaks, and clean debris around the spark plug holes to prevent contaminants from entering the cylinder.