15-21 STI Ultimate Cooling Bundle

Maximum Cooling. Minimum Compromise. When horsepower climbs, so does the heat. Whether you're daily driving, track prepping, or chasing peak performance on your 2015–2021 Subaru STI, this cooling bundle delivers the reliability and efficiency your setup demands. We've combined the GrimmSpeed Front Mount Intercooler Kit with your choice of a CSF Race-Spec Aluminum Radiator—available in raw aluminum or black-coated finish—to help keep coolant and charge temps in check no matter how hard you drive. Cooling systems aren’t just about preventing damage—they’re about unlocking consistent performance. This bundle tackles both sides of the equation: CSF’s 42mm radiator efficiently handles engine coolant temps, while GrimmSpeed’s high-capacity front mount intercooler crushes heat soak and intake charge issues. Together, they create a rock-solid foundation for reliable power delivery in any condition. It’s a proven pairing, designed to work in harmony and eliminate thermal bottlenecks. And when you bundle them together, you save compared to buying each component separately. Included in the Bundle GrimmSpeed Front Mount Intercooler Kit Large 24" x 11" x 4" bar-and-plate core for superior heat dissipation Cast aluminum end tanks with optimized airflow paths Wrinkle black powder-coated piping for a clean, durable finish CNC machined BPV flange, brackets, and all necessary hardware No tuning required for installation CSF Race-Spec Aluminum Radiator (choose your finish) Option 1: Raw Aluminum – Classic motorsport look and proven durability Option 2: Black-Coated Aluminum – Stealthy finish with added corrosion resistance 42mm 2-row core with B-Tube Technology for increased efficiency All-aluminum construction with TIG-welded end tanks Individually pressure tested and vibration cycle validated Direct-fit design works with OEM fans and hoses Fitment 2015–2021 Subaru STI Direct bolt-on install for both the radiator and FMIC