Mishimoto MMTMIC-STI-08BKRD Top-Mount Intercooler for 08-21 Subaru WRX S

Vehicle Fitment

• 2008-2021 Subaru WRX STI (EJ257/EJ255, AWD)
• Fitment confirmed through 2025. 2026 coverage unconfirmed at time of listing.

Features

• Direct-fit top-mount intercooler engineered for WRX STI models
• Powder-coated black core with red silicone hoses for performance aesthetics
• Dense bar-and-plate core design for maximum intake air cooling
• 3.75" thick core with approximately 584 in³ of cooling volume
• Reduces intake charge temperatures by ~10 °F vs stock intercooler
• Proven gains of +5 whp and +7 wtq on stock power levels
• Cast aluminum end tanks TIG-welded for durability
• Includes necessary installation hardware and silicone couplers

Specifications

• Core type: Bar-and-plate aluminum
• Core thickness: 3.75"
• Core cooling volume: ~584 in³
• Overall cooler size: ~24.5" x 11.5" x 4.25"
• Finish: Powder-coated black core with red silicone hoses
• Supports stock to ~400 whp builds
• Maximum recommended boost: ~30 psi

Included Components

• 1x Top-mount intercooler core
• 1x Intercooler to throttle-body transition coupler
• 1x Silicone PCV hose
• 1x Bypass valve (BPV) gasket
• 2x Y-pipe to intercooler gaskets
• 1x Red silicone hose kit

Product Description

The Mishimoto MMTMIC-STI-08BKRD Top-Mount Intercooler Kit is a performance-engineered upgrade designed specifically for Subaru WRX STI models from 2008 through 2021 (AWD, EJ257/EJ255 engines). This direct-fit intercooler features a high-efficiency bar-and-plate core with 3.75" thickness and ~584 in³ cooling volume to significantly improve intake air temperature management compared to the stock unit. On stock vehicles, testing has shown approximately a 10 °F drop in intake temperatures and measurable gains in power and torque under real-world conditions.

Finished with a powder-coated black core and accented with red silicone hoses, the MMTMIC-STI-08BKRD not only enhances performance but also adds a visually striking appearance under the hood. Installation is straightforward and does not require modification to the stock A/C line or Y-pipe, with all necessary hardware and couplers included in the kit. Built to support stock and lightly modified engines up to ~400 whp and backed by Mishimoto's Lifetime Warranty, this intercooler is an excellent choice for enthusiasts seeking improved thermal performance and reliability.