Perrin Front Mount Intercooler Boost Tube Kit Red 2002-2007 WRX / 2004-2007 STI | Stepped Diameter CNC Aluminum | Boost Tube Kit
Overview
The Perrin Front Mount Intercooler Boost Tube Kit is a precision-engineered upgrade designed specifically for 2002-2007 Subaru WRX and 2004-2007 Subaru WRX STI models. This kit replaces the restrictive factory boost tubes with CNC mandrel bent aluminum tubes that optimize airflow from the turbocharger to the intercooler and throttle body. It is ideal for Subaru enthusiasts seeking to improve charge air efficiency and gain immediate power increases without the need for mandatory ECU tuning.
Built with a stepped diameter design, the boost tubes measure 2.25 inches at the turbo outlet and expand to 2.75 inches near the intercooler and throttle body. This smooth, mandrel-bent routing minimizes turbulence and pressure drop, allowing the turbo to operate more efficiently. The tubes are finished in a durable red powder coat that resists corrosion while providing a clean OEM+ appearance. Included in the kit are a new coolant overflow tank with textured powder coating and a boxed steel intercooler support beam that offers enhanced durability over the stock aluminum beam.
Subaru owners will appreciate the real-world gains this kit delivers, with dyno testing showing 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 and effective 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: Stepped diameter tubes reduce boost pressure drop, improving turbo efficiency and delivering noticeable horsepower gains.
-
Durability: CNC mandrel bent aluminum with powder coating resists corrosion and maintains strength under high boost pressures.
-
Fitment: Direct bolt-on design with OEM component clearance ensures hassle-free installation on WRX and STI models.
-
Quality: Includes a boxed steel intercooler support beam for superior crash durability compared to stock aluminum beams.
-
Value: Immediate power gains without mandatory ECU recalibration make this an accessible 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
Shop with confidence at Subimods—your Subaru parts specialists.
