GrimmSpeed Top Mount Intercooler Thermal Black 2002-2007 WRX / 2004-2021 STI / 2004-2008 Forester XT

When you increase boost or push your Subaru harder, the stock TMIC quickly heat-soaks and loses efficiency. The GrimmSpeed TMIC is engineered to deliver maximum cooling with minimal restriction, giving you denser air, reduced knock, and consistent performance pull after pull.

Quick Specs

• Smooth-flow end tank design
• Machined throttle body connection and precision-machined flanges
• Permanent-mold cast end tanks for superior strength and perfect repeatability
• High-density, high-flow bar-and-plate core
• Stainless steel threaded inserts
• Pressure-tested to 50 psi
• Includes GrimmSpeed inlet and BPV gaskets

Design & Core Performance

Using 3D scans of the OEM TMIC, GrimmSpeed engineered a custom core and end tank layout to maximize cooling while keeping pressure drop extremely low. The result is a well-balanced intercooler designed for Subarus making up to 550–575whp, flowing over 1500 CFM, and resisting heat soak far better than stock.

Premium Permanent-Mold End Tanks

Unlike typical sand-cast aftermarket tanks, permanent-mold castings allow tight tolerances, smoother internal surfaces, and greater strength. Each tank is CNC-machined for flawless sealing and optimal airflow.

Performance Testing

On a 2.0L TD04 setup at 19 psi:

• Pressure drop averaged only ~0.1 psi
• OEM TMIC efficiency falls off after 3800–5000 rpm
• GrimmSpeed TMIC maintains stable outlet temps and refuses to heat-soak

Includes:

• GrimmSpeed Top Mount Intercooler
• GrimmSpeed Bypass Valve Gasket
• GrimmSpeed STI TMIC Y-Pipe Gaskets (Pair)
• 36-inch Long 1/2" PCV Hose
• 1/2" Tee Fitting
• 1/2" Hose Connector
• 4x Black M8x1.25-18mm Y-Pipe Bolts
• 2x M8x1.25-25mm Bypass Valve Bolts
• GrimmSpeed Stencil

Installation Instructions