Perrin Front Mount Intercooler Boost Tube Kit Black 2008-2014 STI | 2.25"-2.75" Diameter | Performance Boost Tubes

Overview

The Perrin Front Mount Intercooler Boost Tube Kit for the 2008-2014 Subaru WRX STI is a precision-engineered upgrade designed to optimize airflow between the turbocharger, intercooler, and throttle body. This kit replaces restrictive OEM boost tubes with smooth, mandrel-bent aluminum tubing that improves charge air efficiency and supports higher boost levels. It’s ideal for STI owners looking to enhance power delivery and throttle response without the need for extensive modifications or tuning.

Crafted with a focus on durability and performance, Perrin’s boost tubes feature a stepped diameter design—2.25 inches from the turbo outlet expanding to 2.75 inches near the intercooler and throttle body. This sizing maximizes airflow while maintaining a compact and efficient routing path that avoids interference with OEM components. The tubes are CNC mandrel bent for smooth internal surfaces, powder coated black for corrosion resistance, and equipped with oversized, beaded ends to ensure secure hose connections at any boost pressure.

Beyond the boost tubes themselves, this kit includes a powder-coated coolant overflow tank that improves clearance for the new routing, as well as a robust steel intercooler support beam designed to withstand impacts better than the OEM aluminum bumper beam. The result is a reliable, bolt-on solution that delivers proven gains of 10-20+ wheel horsepower without requiring ECU tuning, making it a practical upgrade for Subaru WRX STI enthusiasts seeking both performance and reliability.

Features & Specifications

This Perrin Front Mount Intercooler Boost Tube Kit is engineered specifically for the 2008-2014 Subaru WRX STI and features stepped boost tube diameters from 2.25” to 2.75”. Constructed from lightweight CNC mandrel-bent aluminum tubing with a durable black powder coat finish, it delivers improved airflow and secure hose connections for enthusiasts aiming to increase power and throttle response.

• Brand: Perrin Performance
• Product: Front Mount Intercooler Boost Tube Kit Black
• Part Number: PSP-ITR-430-3BK
• Fitment: 2008-2010 Subaru WRX STI, 2011-2014 Subaru WRX STI
• Material: CNC Mandrel-Bent Aluminum
• Finish: Black Powder Coat
• Construction: Mandrel Bent Tubing with Beaded Ends
• Origin: USA
• Boost Tube Diameter: 2.25” (Turbo Outlet) to 2.75” (Intercooler/Throttle Body)
• Included Components: Coolant Overflow Tank, Steel Intercooler Support Beam
• Power Gains: +10-20+ Wheel HP (Dyno Proven)
• Tuning Required: No tuning required; tuning recommended for additional gains

Key Benefits

• Performance: Increased airflow reduces pressure drop, supporting 10-20+ wheel horsepower gains across power levels.
• Durability: Powder-coated aluminum tubing and a boxed steel support beam ensure long-lasting reliability and impact resistance.
• Fitment: Designed specifically for 2008-2014 STI models with precise routing that maintains OEM component clearance.
• Installation: Includes coolant overflow tank for improved clearance, simplifying installation and maintaining engine bay organization.
• Quality: CNC mandrel bending ensures smooth internal surfaces for optimal airflow and secure beaded ends prevent boost leaks.
• Value: Bolt-on upgrade that delivers measurable power improvements without mandatory ECU recalibration.

What's Included

• 1× Perrin Front Mount Intercooler Boost Tube Kit Black
• 1× Perrin Coolant Overflow Tank (Powder Coated)
• 1× Perrin Steel Intercooler Support Beam (Powder Coated)
• Mounting hardware for boost tubes and support beam
• Installation instructions

Installation & Compatibility

The Perrin Front Mount Intercooler Boost Tube Kit is a direct bolt-on upgrade designed for straightforward installation with basic hand tools, making it accessible for enthusiasts with moderate mechanical experience. The included coolant overflow tank and support beam facilitate proper fitment and clearance, minimizing the need for modifications. No ECU tuning is required to safely run this kit, though additional tuning can unlock further power gains. Verify fitment for your specific STI model year before purchase to ensure compatibility.

• Professional Installation: Recommended for best results but DIY-friendly with mechanical knowledge
• Modifications Required: None
• Verify Compatibility: Confirm fitment for 2008-2010 and 2011-2014 Subaru WRX STI models

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