Perrin Front Mount Intercooler Boost Tube Kit Red 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 2002-2007 Subaru WRX and 2004-2007 Subaru WRX STI models. This kit replaces the restrictive factory boost tubes with a set of CNC mandrel bent aluminum tubes that optimize airflow from the turbocharger to the intercooler and throttle body. Ideal for Subaru enthusiasts looking to improve their vehicle’s charge air efficiency, this kit supports increased power output without the need for immediate ECU tuning.

Engineered with precision, the boost tubes feature a stepped diameter design—2.25 inches at the turbo outlet expanding to 2.75 inches near the intercooler and throttle body. This smooth, mandrel-bent routing minimizes turbulence and pressure drop, allowing the turbo to breathe more freely. The tubes are powder coated in durable red, providing corrosion resistance and a clean OEM+ appearance. The kit also includes a new coolant overflow tank with textured powder coating to clear space for the upgraded boost tubes, as well as a robust boxed steel intercooler support beam for enhanced durability compared to stock aluminum beams.

Subaru owners will appreciate the real-world gains this kit delivers. Dyno testing shows a 10 to 20+ wheel horsepower increase thanks to improved charge air cooling and reduced boost pressure loss. The design maintains OEM component clearance for straightforward installation and reliable fitment. While no tuning is required to enjoy immediate power gains, further ECU calibration can unlock additional performance when combined with other modifications. This kit is a practical upgrade for WRX and STI drivers focused on maximizing their turbocharged Subaru’s potential.

Features & Specifications

This Perrin Front Mount Intercooler Boost Tube Kit is engineered for 2002-2007 Subaru WRX and 2004-2007 STI models and features stepped 2.25” to 2.75” boost tube diameters. Constructed from lightweight CNC mandrel bent aluminum tubing with a durable red powder coat finish, it delivers improved airflow and boost efficiency for Subaru enthusiasts seeking reliable power gains and OEM+ quality.

• Brand: Perrin Performance
• Product: Front Mount Intercooler Boost Tube Kit Red
• Part Number: PSP-ITR-400-3RD
• Fitment: 2002-2003 WRX, 2004-2005 STI, 2004-2005 WRX, 2006-2007 STI, 2006-2007 WRX
• Material: Aluminum
• Finish: Red powder coat
• Construction: CNC mandrel bent tubing with beaded ends
• Origin: USA (Perrin Performance)
• Power Gains: +10-20+ Wheel HP (dyno proven)
• Tuning Required: No tuning required, tuning recommended for maximum gains

Key Benefits

• Performance: Increases airflow efficiency with stepped diameter tubes, reducing boost pressure drop for noticeable horsepower gains.
• Durability: CNC mandrel bent aluminum construction with powder coating resists corrosion and maintains strength under boost pressure.
• Fitment: Designed for a direct fit on 2002-2007 WRX and 2004-2007 STI models with OEM component clearance for hassle-free installation.
• Quality: Includes a boxed steel intercooler support beam for superior crash durability compared to stock aluminum beams.
• Value: No ECU recalibration needed to gain power, making it a straightforward upgrade for street and mild performance builds.
• Aesthetics: Vibrant red powder coat finish adds a clean, performance-oriented look under the hood.

What's Included

• 1× Perrin Front Mount Intercooler Boost Tube Kit Red
• 1× Perrin Coolant Overflow Tank with textured powder coating
• 1× Perrin Boxed Steel Intercooler Support Beam, powder coated black
• 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 a direct bolt-on fit with no permanent modifications required. The included coolant overflow tank provides necessary clearance for the larger boost tubes, simplifying routing. While no ECU tuning is required to realize power gains, professional tuning is recommended if additional modifications are present to optimize performance and ensure safe operation.

• Professional Installation: Recommended for best results
• Modifications Required: None; direct bolt-on replacement
• Verify Compatibility: Confirm fitment for your specific year and trim level within 2002-2007 WRX and 2004-2007 STI models

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