Perrin Front Mount Intercooler Boost Tube Kit Black 2002-2007 WRX / 2004-2007 STI | CNC Mandrel Bent Aluminum | Boost Tube Kit

Overview

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.

Features & Specifications

This Perrin Front Mount Intercooler Boost Tube Kit is engineered for 2002-2007 Subaru WRX and 2004-2007 WRX STI models and features stepped 2.25” to 2.75” diameter aluminum tubing. Constructed from CNC mandrel bent lightweight aluminum, it delivers improved airflow and boost response for Subaru enthusiasts seeking reliable power gains and OEM+ fitment.

• Brand: Perrin Performance
• Product: Front Mount Intercooler Boost Tube Kit Black
• Part Number: PSP-ITR-400-3BK
• Fitment: 2002-2003 WRX, 2004-2005 STI, 2004-2005 WRX, 2006-2007 STI, 2006-2007 WRX
• Material: Aluminum
• Finish: Black powder coat
• Construction: CNC mandrel bent tubing with beaded ends
• Origin: USA (Perrin Performance)
• Boost Tube Diameter: 2.25” (turbo side) to 2.75” (intercooler/throttle body side)
• Included Components: Boost tubes, coolant overflow tank, intercooler support beam
• Power Gains: +10-20+ Wheel HP (dyno proven)
• Tuning Required: No tuning required for stock ECU, tuning recommended for additional gains

Key Benefits

• Performance: Increased airflow reduces pressure drop, improving turbo efficiency and throttle response.
• Durability: CNC mandrel bent aluminum tubing with powder coat finish resists corrosion and maintains strength under boost.
• Fitment: Designed for direct bolt-on installation with OEM clearance and included coolant tank for seamless integration.
• Power Gains: Dyno proven to add 10-20+ wheel horsepower without ECU recalibration.
• Support & Protection: Steel intercooler support beam offers superior collision durability compared to factory aluminum beams.
• OEM+ Quality: Clean black powder coat finish complements the engine bay aesthetics while protecting components.

What's Included

• 1× Perrin Front Mount Intercooler Boost Tube Kit Black
• 1× Perrin Coolant Overflow Tank (powder coated)
• 1× Perrin Intercooler Support Beam (boxed steel, powder coated)
• Mounting hardware for boost tubes and support beam
• Installation instructions

Installation & Compatibility

Installation of the Perrin Boost Tube Kit is moderately straightforward for enthusiasts with basic mechanical skills and common hand tools. The kit is designed for direct bolt-on fitment with no permanent modifications required. The included coolant overflow tank provides necessary clearance for the larger boost tubes, simplifying installation. While no ECU tuning is required to realize power gains, tuning is recommended to optimize performance if additional modifications are present. Always verify fitment for your specific model year and trim before installation.

• Professional Installation: Recommended for those unfamiliar with turbo system components
• Modifications Required: None
• Verify Compatibility: Confirm fitment for your specific year and trim level within 2002-2007 WRX and 2004-2007 STI

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