Perrin Turbo Inlet Hose Black 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, reduces turbo lag, and sharpens throttle response without requiring any ECU tuning. It is ideal for Subaru enthusiasts looking to extract more performance from their turbocharged engines while maintaining reliability and OEM-level fitment.
Engineered with a smooth internal bore and a significantly 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 resists collapse under high boost pressures and when paired with restrictive air filters or larger turbo setups. The inclusion of a glass-filled nylon coupler and machined aluminum blow-off valve connection reflects Perrin’s commitment to durability and precision engineering.
For Subaru owners, this turbo inlet hose delivers tangible real-world benefits: quicker turbo spool times, improved acceleration, and a more responsive driving experience. Its plug-and-play crankcase vent connector preserves emissions compliance without modification, making it a practical upgrade for street and track use. Whether you’re running stock boost or pushing higher power levels, the Perrin Turbo Inlet Hose is a proven way to optimize your Subaru’s intake efficiency.
Features & Specifications
This Perrin Turbo Inlet Hose is engineered for 2002-2007 WRX, 2004-2021 WRX STI, and 2004-2008 Forester XT models and features a smooth, large-diameter silicone construction with stainless steel reinforcement. Constructed from high-grade silicone and glass-filled nylon, it delivers increased airflow and durability for Subaru enthusiasts seeking enhanced turbo response and horsepower gains.
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Brand: Perrin Performance
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Product: Turbo Inlet Hose Black 2002-2007 WRX / 2004-2021 STI / 2004-2008 Forester XT
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Part Number: PSP-INT-401BK
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Fitment: 2002-2007 Subaru WRX, 2004-2021 Subaru WRX STI, 2004-2008 Subaru Forester XT
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Material: Silicone with stainless steel support wire, glass-filled nylon coupler
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Finish: Black silicone
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Construction: Reinforced molded silicone with embedded stainless steel wire and machined aluminum blow-off valve insert
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Origin: USA
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Tuning Required: No (tuning recommended for additional gains)
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Blow Off Valve Connection: Machined aluminum insert bonded into hose
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Crank Case Vent Connector: OEM-style plug-and-play design
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Spigot Size: 1/2" ID glass-reinforced nylon fittings
Key Benefits
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Performance: Increases horsepower and torque by improving airflow and reducing turbo spool time
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Durability: Stainless steel reinforcement prevents hose collapse under high boost and extreme conditions
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Fitment: Direct bolt-on replacement with OEM-style crankcase vent connector preserves emissions compliance
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Quality: High-grade silicone and glass-filled nylon components withstand engine bay heat and wear
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Throttle Response: Smooth internal bore eliminates restrictions for sharper acceleration feel
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Ease of Installation: Includes all necessary fittings and clamps for a complete upgrade
What's Included
- 1× Perrin Turbo Inlet Hose (PSP-INT-401BK)
- 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
Installation of the Perrin Turbo Inlet Hose is straightforward and designed for a direct bolt-on fitment with no permanent modifications required. The included OEM-style crankcase vent connector allows you to retain factory emissions components without defeating any devices. Basic hand tools are sufficient for installation, making this a DIY-friendly upgrade for most Subaru enthusiasts. While no ECU tuning is required to realize power gains, additional tuning can unlock further performance potential, especially on modified or high-boost setups.
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Professional Installation: DIY-friendly
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Modifications Required: None
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Verify Compatibility: Confirm fitment for your specific year and model before purchase
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