Perrin Front Mount Intercooler Boost Tube Kit Neon Yellow 2015-2021 STI | 2.25"-2.75" Diameter | Boost Tube Kit

Overview

The Perrin Front Mount Intercooler Boost Tube Kit is designed specifically for the 2015-2021 Subaru WRX STI, offering a direct upgrade to your vehicle’s intake charge path. This kit replaces the restrictive OEM boost tubes with larger diameter, smooth mandrel-bent aluminum tubes that optimize airflow from the turbocharger to the intercooler and throttle body. It’s ideal for STI owners looking to reduce pressure drop, improve boost response, and support higher power levels without compromising reliability.

Engineered with precision CNC mandrel bending, the boost tubes maintain a smooth, short routing path that minimizes turbulence and maximizes airflow efficiency. The oversized, beaded ends ensure a secure, airtight seal with OEM hoses at any boost level. Finished in a durable neon yellow powder coat, these tubes not only resist corrosion but also add a distinctive visual upgrade under the hood. The kit also includes custom CNC-machined aluminum intercooler brackets, a high-capacity washer fluid tank, and a textured powder-coated coolant overflow tank to facilitate clean and efficient installation.

Real-world benefits include a proven gain of 10 to 20+ wheel horsepower across various power levels, achieved through improved charge air cooling and reduced intake restriction. The design requires no ECU tuning to safely increase power, making it a straightforward upgrade for STI enthusiasts. For those pursuing further modifications, the kit supports additional tuning to unlock even greater performance potential, all while maintaining OEM-level fitment and durability.

Features & Specifications

This Perrin Front Mount Intercooler Boost Tube Kit is engineered for the 2015-2021 Subaru WRX STI and features boost tube diameters ranging from 2.25 inches at the turbo outlet to 2.75 inches near the throttle body. Constructed from lightweight CNC mandrel-bent aluminum tubing, it delivers improved airflow and durability for Subaru enthusiasts seeking enhanced boost response and power gains.

• Brand: Perrin Performance
• Product: Front Mount Intercooler Boost Tube Kit Neon Yellow
• Part Number: PSP-ITR-438-3NY
• Fitment: 2015-2021 Subaru WRX STI
• Material: Aluminum
• Finish: Neon Yellow Powder Coat
• Construction: CNC Mandrel Bent Tubing with Beaded Ends
• Origin: Not Specified
• Boost Tube Diameter: 2.25" (Turbo Outlet) to 2.75" (Throttle Body)
• Included Components: Coolant Overflow Tank, Washer Fluid Tank, Direct Mount Intercooler Brackets
• Power Gains: +10-20+ Wheel HP (Dyno Proven)
• Tuning Required: No (Recommended for additional gains)

Key Benefits

• Performance: Increases airflow efficiency with larger diameter tubes, reducing pressure drop and improving boost response.
• Durability: Powder-coated aluminum construction resists corrosion and withstands heat for long-lasting reliability.
• Fitment: Designed specifically for 2015-2021 STI models with direct bolt-on installation and included mounting brackets.
• Visual Impact: Neon yellow finish adds a standout aesthetic to the engine bay while protecting against environmental damage.
• Ease of Installation: Includes coolant and washer fluid tanks engineered to clear boost tube routing for a clean, professional fit.
• Value: Provides significant horsepower gains without requiring immediate ECU tuning, making it a practical upgrade.

What's Included

• 1× Perrin Front Mount Intercooler Boost Tube Kit Neon Yellow
• 1× Perrin Coolant Overflow Tank (Powder Coated)
• 1× Perrin High Capacity Washer Fluid Tank (6061 Aluminum)
• 1× Set of CNC Machined Direct Mount Intercooler Brackets
• Installation instructions

Installation & Compatibility

The Perrin Boost Tube Kit is designed for a straightforward installation with direct-mount brackets and included coolant and washer tanks to ensure proper clearance. While the installation is generally DIY-friendly for enthusiasts with basic mechanical skills, professional installation is recommended for those unfamiliar with intercooler or intake system work. No special tools beyond standard hand tools are typically required. This kit fits 2015-2021 Subaru WRX STI models exclusively and requires no ECU tuning to safely increase power, though tuning is recommended to maximize gains if additional modifications are present.

• Professional Installation: Recommended for best results
• Modifications Required: None beyond included components
• Verify Compatibility: Confirm fitment for your specific STI model year and trim

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