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Air and Fuel› Air and Fuel Cooling Systems and Components

STI

Intercooler

$773.52 $529.09 Save $244.43

SKU: 21820AA500

In Stock
In Stock
Ships by Aug 4
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30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The STI Intercooler (Part Number: 21820AA500) is a genuine OEM replacement part designed to maintain the optimal performance of your Subaru STI's engine. This intercooler is specifically engineered for a direct fit on Subaru STI models from the 2017 to 2021 model years. Its construction from aluminum with a black finish ensures durability and a stealthy appearance within the engine bay. Ensure proper fitment by confirming your vehicle's year and model within the provided compatibility list. This component is crucial for managing intake air temperature, which directly impacts engine efficiency and power output.

MIA's Description

The STI Intercooler is a direct replacement part for your Subaru STI.

This intercooler is designed to fit STI models from 2017 to 2021. It is made of aluminum and features a black finish.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandSTI
Part Number21820AA500
CategoryAir and Fuel

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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