Subaru OEM Subaru OE Passenger Side Breather Hose Subaru WRX 06-07 / STI 04-10 | 99071AB333

Product Fitment:

• 2004–2006 Subaru Baja
• 2004–2008 Subaru Forester XT
• 2004–2010 Subaru STI
• 2006–2007 Subaru WRX

Overview

The Genuine Subaru OEM Passenger Side Breather Hose (Part #99071AB333) is an exact-fit factory replacement designed for the WRX, STI and Forester XT. This crankcase ventilation breather hose maintains proper engine breathing and pressure management, helping to prevent oil leaks and ensuring your turbocharged engine runs cleanly and efficiently. Choosing a Genuine Subaru OEM part guarantees factory-spec materials, perfect fitment, and compatibility with your vehicle's emissions and PCV system.

Key Features & Benefits

• Genuine Subaru OEM Quality — Manufactured to factory specifications, ensuring exact fit and long-term reliability with no modifications required.
• Exact Passenger Side Fitment — Designed specifically for the passenger-side crankcase breather circuit on EJ257 and EJ255 turbocharged engines, eliminating guesswork.
• Durable OEM-Grade Materials — Constructed from heat- and oil-resistant materials that withstand the high-temperature environment of a turbocharged engine bay.
• Proper Crankcase Pressure Management — Maintains correct positive crankcase ventilation (PCV) system function, helping to reduce oil consumption and prevent seal damage.
• Factory Warranty Backed — Covered under Subaru's genuine parts warranty for added peace of mind.
• Direct OEM Replacement — Replaces worn, cracked, or collapsed breather hoses that can cause rough idle, oil leaks, or boost leaks on high-performance STI and Forester XT applications.

What's Included

• 1x Genuine Subaru Passenger Side Breather Hose (Part #99071AB333)

Specifications

Installation

This is a direct bolt-on/slip-on OEM replacement hose. Installation typically involves releasing the factory hose clamps, removing the old breather hose, and routing and securing the new hose in its place. No special tools are required, though basic mechanical knowledge is recommended. For best results on high-mileage or turbocharged applications, inspect surrounding hoses and clamps during replacement. Professional installation is recommended if you are unfamiliar with crankcase ventilation systems.