Details

• Brand:

  

• SKU:

  21869AA121

• Other Names:

  Adapter, Duct, Hose Air Duct

• Description:

  2.5L. Sti.

  
  

  Air Duct – Subaru (21869AA121)

  The Air Duct – Subaru (21869AA121) is a genuine OEM component designed to deliver precise airflow management within your Subaru’s intake system. Manufactured to strict factory specifications, this air duct ensures seamless integration with the airbox, turbocharger, and intercooler—helping to maintain proper engine breathing and consistent performance under all driving conditions.

  Constructed from durable, heat-resistant plastic compound, this air duct withstands engine bay temperatures and resists degradation from exposure to dirt, oil vapors, and vibration. Its precision-molded shape replicates Subaru’s original route, ensuring an airtight seal and preventing unfiltered air from entering the intake stream. Integrated mounting points and retention tabs match factory fittings, which simplifies installation for both seasoned technicians and DIY enthusiasts.

  For professional mechanics, the 21869AA121 air duct offers a factory-correct replacement that supports proper engine tuning and airflow efficiency. DIY car owners will appreciate its direct-fit design—installing this OEM part requires no trimming, drilling, or modifications, and fastens securely in minutes.

  A worn or damaged air duct can allow air leaks, disrupt meter readings, or introduce contaminants—leading to rough idle, reduced power, poor fuel economy, or even engine damage. Choosing the Subaru OEM air duct helps ensure precise airflow control, proper sensor operation, and long-term engine health.

  ✔ Genuine Subaru OEM part for exact fit and original performance  

  ✔ High-quality, heat-resistant plastic construction resists wear and heat

   ✔ Factory-molded shape with precise mounting points—no modifications needed

   ✔ Prevents intake leaks and protects engine from contaminants

   ✔ Supports optimal airflow, throttle response, and fuel efficiency

  Trust the Subaru (21869AA121) Air Duct to restore OEM-level airflow management, safeguarding both engine performance and longevity.

  
  

• Condition: New
• Notes: Included with intercooler.
• Replaces:

  21869aa120

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