Perrin Turbo Inlet Hose Red 2002-2007 WRX / 2004-2021 STI / 2004-2008 Forester XT

Perrin Turbo Inlet Hose Red 2002-2007 WRX / 2004-2021 STI / 2004-2008 Forester XT | Increased Airflow | Performance Turbo Inlet Hose

Overview

The Perrin Turbo Inlet Hose is a direct replacement for the restrictive OEM turbo inlet hose found on select Subaru WRX, WRX STI, and Forester XT models. Designed to improve airflow into the turbocharger, this high-quality silicone hose enhances horsepower, throttle response, and turbo spool time without requiring ECU tuning. It’s an ideal upgrade for Subaru enthusiasts looking to unlock additional power and reliability from their turbocharged engines while adding a clean, performance-oriented look to the engine bay.

Engineered with a smooth internal surface and a larger diameter than the factory hose, the Perrin inlet hose eliminates the pleats and restrictions that limit airflow in the OEM design. Reinforced with an embedded stainless steel support wire, it maintains structural integrity under high boost pressures and prevents collapse, even when paired with restrictive air filters or larger turbo setups. The inclusion of a glass-filled nylon coupler and a machined aluminum blow-off valve connection further exemplifies Perrin’s commitment to durability and precision engineering.

For Subaru owners, this turbo inlet hose delivers tangible performance benefits such as quicker turbo spool, improved acceleration, and increased horsepower—all while maintaining factory emission controls thanks to the integrated OEM-style crankcase vent connector. Whether you’re running a stock setup or planning future tuning, this hose is a reliable and effective upgrade that complements the Subaru turbocharged driving experience.

Features & Specifications

This Perrin Turbo Inlet Hose is engineered for Subaru WRX, WRX STI, and Forester XT platforms and features a smooth, large-diameter silicone construction with stainless steel reinforcement. Constructed from high-quality silicone and glass-filled nylon, it delivers improved airflow and durability for Subaru enthusiasts seeking enhanced turbo response and horsepower gains.

• Brand: Perrin Performance
• Product: Turbo Inlet Hose Red 2002-2007 WRX / 2004-2021 STI / 2004-2008 Forester XT
• Part Number: PSP-INT-401RD
• Fitment: 2002-2007 Subaru WRX, 2004-2021 Subaru WRX STI, 2004-2008 Subaru Forester XT
• Material: Silicone with stainless steel support wire, glass-filled nylon coupler
• Finish: Red silicone
• Construction: Reinforced molded silicone with embedded stainless steel wire and machined aluminum blow-off valve insert
• Origin: Made in USA
• Tuning Required: No (tuning recommended for additional gains)
• Blow Off Valve Connection: Machined aluminum insert bonded into silicone layers
• Crank Case Vent Connector: OEM-style plug-n-play connector included

Key Benefits

• Performance: Increases horsepower and torque by improving airflow and reducing turbo inlet restrictions
• Durability: Stainless steel reinforcement prevents hose collapse under high boost and extreme conditions
• Fitment: Direct bolt-on replacement with OEM-style crankcase vent connector preserves emissions compliance
• Throttle Response: Smoother internal surface and larger diameter reduce turbo lag and improve acceleration
• Quality: Made from high-grade silicone and glass-filled nylon for heat resistance and longevity
• Installation: Includes all necessary hardware and connectors for a straightforward upgrade

What's Included

• 1× Perrin Turbo Inlet Hose Red (PSP-INT-401RD)
• 1× Glass-filled nylon coupler
• 1× OEM-style crankcase vent diagnosis connector
• 1× 15" vacuum hose
• 1× 48 clamp
• 1× 36 clamp
• 2× 6 clamps
• 2× 1/2"-1/2" 90 degree connectors
• 2× 1/2"-3/8" 90 degree connectors
• 1× Perrin license plate frame
• Installation instructions

Installation & Compatibility

The Perrin Turbo Inlet Hose is a direct bolt-on upgrade designed for easy installation with basic hand tools, making it a DIY-friendly project for most Subaru enthusiasts. No special tools are required beyond standard clamps and screwdrivers. The hose fits 2002-2007 WRX, 2004-2021 WRX STI, and 2004-2008 Forester XT models without modification. While no ECU tuning is required to realize power gains, additional tuning can unlock further performance benefits. The included OEM-style crankcase vent connector ensures emissions compliance without defeating factory systems.

• Professional Installation: Recommended for those unfamiliar with turbo system components
• Modifications Required: None
• Verify Compatibility: Confirm fitment for your specific year and trim level before purchase

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