GrimmSpeed Billet Top Mount Intercooler Kit - 2022+ Subaru WRX, 2019+ Ascent


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GrimmSpeed SKU: GRM113049BLK

In Stock

Color: Black
Raw Aluminum

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For more than 10 years, GrimmSpeed Top Mount Intercoolers have been the go-to for quality and performance. We have been leading the charge in Subaru aftermarket innovation, with a collection of products that set the bar higher and push competitors to keep up. In true GrimmSpeed fashion, we are continuing this tradition and are happy to say that we have raised the bar... again!

This top-of-the-line intercooler boasts a range of innovative features, including a CnC’d billet aluminum construction and a sleek, stylish design that will complement the look of your vehicle perfectly. Not only does it look great, but it also delivers superior performance, thanks to its advanced cooling features and improved airflow. So, whether you are looking for a functional upgrade to your WRX or simply want to add some extra style to your ride, the GrimmSpeed Billet Top Mount Intercooler is the perfect choice for you. Do not settle for anything less than the best - we want you to upgrade your new Subaru WRX today with the best intercooler in the industry!


When developing the intercooler, we applied our experience to focus on key factors such as increased airflow, reduced restriction, and higher flow rates, resulting in less pressure drop across the core. After 3D scanning our R&D vehicle we created a virtual model of the 2022 WRX. Using this data, we were able to design this intercooler to fit within the constraints of the tightly packaged engine bay. The new TMIC uses a 19in x 7in x 4in cross-flow core with bar and plate construction, providing a 63% increase in total volume and 209% more flow area than the stock top mount. Even with the added volume, we were able to maintain factory fitment of the charge pipe, throttle body, and hood ducting interface.

When examining the intercooler, it is immediately apparent that the billet aluminum end tanks are the standout feature. Our team made a conscious decision to depart from tradition and experiment with an innovative design approach for this iteration of the intercooler. We felt that it was important to create a product that was not only functional, but also visually aligned with the sleek and modern aesthetic of the new generation VB WRX body style.

We used 4-axis CNC milling technology to ensure that the TMIC is precisely crafted with the utmost care. By utilizing this technology, we can produce our end tanks with a higher degree of accuracy and consistency than our traditional manufacturing methods. Along with this, we were able to streamline the installation process of the billet top mount intercooler by applying the same quick release double O-ring technology used on the OEM unit, making installation a breeze from start to finish. This ensures our end tanks will not fail or leak over time. If for some reason an issue comes up, customers can depend on GrimmSpeed's well-known customer service and Limited Lifetime Warranty policy.


  • Billet Aluminum End Tanks – Designed for equal flow distribution and minimum pressure drop
  • Pressure Tested In-House – Cleaned, sealed, and guaranteed to work prior to delivery
  • Leak resistant throttle body connection - Pre-installed Double O-Ring ensures a leak free connection at elevated boost levels
  • No tune required – Can safely be run on factory calibration


  • Subaru WRX (Base, Limited, Premium, GT) - 2022-2024
  • Subaru Ascent (Base, Limited, Touring, Onyx) - 2019-2023
  • Subaru Legacy XT (Sport, Touring) - 2020-2023
  • Subaru Outback XT (Base, Limited, Touring) - 2020-2023
  • Subaru Outback Wilderness - 2021-2023


PDF - Subaru 22+ WRX, 19+ Ascent, 20+ Outback XT, 20+ Legacy XT Top Mount Intercooler Install Instructions