Every turbo needs to breathe. On Subaru’s FA20 turbo engines, the factory plastic inlet hose is one of the biggest restrictions in the intake path. Cracks, leaks, and poor design leave you with slower spool, laggy throttle response, and inconsistency when you need power most.
In this post, we’ll break down what’s going wrong, why it happens, and how Roo Racing’s High-Flow FA20 Turbo Inlet Hose solves the problem for good.
The Problem: A Factory Hose That Holds You Back
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The stock FA20 inlet hose is made from thin, corrugated plastic.
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Over time it warps, cracks, or collapses under boost and heat.
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Corrugations inside the hose disturb airflow, slowing down spool and creating turbulence.
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Many owners report loose clamps or vacuum leaks around the inlet, leading to inconsistent boost.
👉 In short: the factory inlet hose is a weak link in the FA20 platform.
Why It Happens: Heat, Pressure, and Poor Materials
| Cause | Effect |
|---|---|
| High heat cycles | Plastic softens, warps, and loses clamp torque |
| Boost pressure | Hose can collapse under suction |
| Corrugated design | Creates turbulence, slows airflow |
| PCV routing stress | Oil blow-by increases risk of leaks |
The Solution, A High-Flow Inlet Hose
The Roo Racing inlet hose is engineered to replace the factory weak spot with performance-focused design.
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Smooth bore, larger internal diameter – unrestricted airflow, less turbulence.
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Multi-layer silicone + stainless support wire – won’t collapse under boost.
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OEM-style PCV connector – no dodgy adapters, emissions intact.
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Easy install – fits with basic tooling.
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Roo Racing details – CNC-machined BOV port insert, heat-rated nylon spigots, subtle Roo branding.
How to Upgrade: Step by Step
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Remove factory inlet hose, PCV lines, and clamps.
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Inspect turbo inlet flange and clean mating surfaces.
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Fit Roo Racing inlet hose, align PCV port correctly.
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Tighten supplied clamps evenly.
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Start the engine, check for leaks, and retighten after first drive.
Estimated install time: 1 hour with basic hand tools.
Fitment
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Subaru WRX 2015–2021 (FA20F)
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Subaru Forester XT 2014–2018 (FA20F)
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Subaru Levorg 2014–2020 (FA20F)
The stock FA20 inlet hose is a ticking time bomb for performance. Roo Racing’s High-Flow FA20 Turbo Inlet Hose fixes it permanently with stronger materials, smarter design, and a hassle-free install.
⚡ Built for Boost. Backed by Roo.
https://rooracing.au/products/roo-racing-silicone-inlet-hose-wrx-va-2015-2021