Description
The Perrin Front Mount Intercooler Boost Tube Kit is designed specifically for Subaru WRX and WRX STI models from 2002 to 2007. This kit replaces the factory boost tubes with larger diameter, smooth mandrel-bent aluminum tubes that improve airflow from the turbocharger to the intercooler and throttle body. It is ideal for Subaru enthusiasts looking to maximize their turbo system’s efficiency and gain additional power without the need for extensive modifications.
Engineered with precision, Perrin’s boost tubes feature a stepped diameter design, starting at 2.25 inches near the turbo and expanding to 2.75 inches at the intercooler and throttle body ends. This design minimizes airflow restrictions and pressure drop, while the oversized beaded ends ensure secure hose connections capable of handling high boost pressures. The tubes are powder coated black for durability and corrosion resistance, maintaining a clean OEM+ appearance under the hood.
Along with the boost tubes, this kit includes a new coolant overflow tank and a robust steel intercooler support beam. The coolant tank is powder coated to resist the elements and provides necessary clearance for the larger tubes, while the steel support beam offers superior durability compared to the factory aluminum bumper beam. Dyno testing shows gains of 10 to 20+ wheel horsepower with this setup, achieved without requiring ECU tuning—though additional gains are possible with proper calibration. This kit enhances the cooling efficiency and throttle response of your Subaru’s turbo system, making it a practical upgrade for both street and performance applications.