PERRIN Front Mount Intercooler Boost Tube Kit Black Subaru STI 2015-2021 | PSP-ITR-438-3BK

Product Fitment: 

2015-2021 Subaru STI

At the core of this system are the PERRIN Boost Tubes, designed with a smooth, shortest-path routing to reduce restriction and improve airflow. With tubing diameters expanding from 2.25” at the turbo to 2.75” at the throttle body, this setup supports airflow levels beyond what most turbochargers can produce—making it ideal for high-horsepower applications.

Constructed from lightweight CNC mandrel-bent aluminum, the boost tubes feature oversized beaded ends to ensure secure, leak-free connections under any boost level. Each tube is finished with a durable powder coating for long-term protection and is available in three finishes:

• Gloss Neon Yellow

• Textured Black

• Red

To accommodate proper routing and maximize engine bay space, this kit includes a high-capacity 6061 aluminum washer fluid tank, allowing for clean installation without sacrificing functionality.

Also included is a PERRIN Coolant Overflow Tank, finished in a textured powder coat for durability and corrosion resistance. This redesigned tank improves clearance for intercooler piping while maintaining OEM functionality.

For secure mounting, the kit utilizes CNC-machined direct-mount intercooler brackets made from lightweight aluminum. These brackets provide exceptional rigidity, corrosion resistance, and a clean, performance-focused appearance.

Key Features:

• Complete FMIC kit for 2015–2021 Subaru WRX STI

• Optimized boost tube routing for maximum airflow

• Tube sizing:

  • 2.25” (turbo side)

  • 2.75” (intercooler to throttle body)

• CNC mandrel-bent aluminum boost tubes

• Oversized beaded ends for secure, leak-free connections

• Available finishes: Neon Yellow, Black, Red

• Includes 6061 aluminum high-capacity washer fluid tank

• Includes PERRIN coolant overflow tank (powder coated)

• Lightweight CNC-machined aluminum intercooler brackets

• Maintains clearance with OEM components

• Bumper Beam Sold Separately

Performance Benefits:

• Increases airflow and turbo efficiency

• Supports high horsepower and increased boost levels

• Reduces airflow restriction for improved throttle response

• Enhances engine bay layout and component clearance

• Provides durable, long-lasting performance components

Construction & Design:

• Lightweight aluminum piping and brackets

• Powder-coated components for corrosion resistance

• Precision CNC machining for exact fitment

• Engineered for clean installation and performance reliability