Subaru OEM Intercooler (08-14 STI) | 21820AA380

Overview

The Genuine Subaru OEM Intercooler (Part #21820AA380) is the factory-original front-mount intercooler designed specifically for the 2008–2014 Subaru WRX STI. Built to the same exacting standards as the unit installed at the factory, this OEM intercooler ensures optimal charge-air cooling for your turbocharged EJ257 engine, delivering consistent performance, reliability, and an exact fit without modification. Whether you're replacing a damaged unit or restoring your STI to factory specification, this is the definitive replacement intercooler.

Key Features & Benefits

• Genuine Subaru OEM Quality — Manufactured to Subaru's original factory specifications, ensuring the same performance and durability as the unit your STI left the factory with.
• Exact-Fit Guarantee — Designed as a direct, bolt-on replacement for 2008–2014 WRX STI models; no modifications or adapter hardware required.
• Optimal Charge-Air Cooling — Factory-engineered core and end-tank design efficiently reduces compressed intake air temperature, protecting the EJ257 engine and maintaining consistent power output.
• Factory Warranty Coverage — As a genuine Subaru OEM part, this intercooler is backed by Subaru's standard OEM parts warranty.
• Verified Part Number 21820AA380 — Cross-reference directly with your OEM part number to confirm correct fitment before ordering.
• Direct Replacement — Restores your STI's turbocharged system to factory condition, ideal for track-day resets, collision repair, or routine replacement due to core damage or leaks.

What's Included

• 1x Genuine Subaru OEM Intercooler (Part #21820AA380)

Specifications

Fitment & Compatibility

This intercooler is a direct OEM replacement for the following Subaru vehicles:

Always verify your vehicle's VIN and existing OEM part number (21820AA380) before ordering to confirm compatibility. If you are unsure, consult your Subaru dealer's parts catalog or use your VIN for an exact fitment check.

Installation

This is a direct bolt-on OEM replacement intercooler. Installation involves removal of the front bumper cover, disconnection of the intercooler inlet and outlet hoses, and unbolting the intercooler from its mounting brackets — then reversing the process with the new unit. While experienced DIY enthusiasts can complete this job at home with basic hand tools, professional installation by a qualified technician is recommended to ensure all boost hoses are properly seated and clamps are torqued to specification. Always inspect all intercooler hoses and clamps for wear during replacement.