Go Fast Bits T9000 Respons BOV for 98-04 Subaru WRX STI/Forester XT

Vehicle Fitment

• 1999-2000 Subaru Impreza WRX / STI (GC/GF/GM, EJ20 turbo, AWD)
• 1998-2002 Subaru Liberty / Legacy B4 (BE/BH, EJ20 twin-turbo, AWD)
• 1998-2004 Subaru Forester GT / XT (SF/SG, EJ20 turbo / EJ25 turbo, AWD)

Features

• Direct-fit Respons TMS blow-off valve for selected Subaru turbo applications
• Patented venting bias adjustment system allows tuning between recirculated and atmospheric discharge
• Adjustable sound output from quiet recirculation to loud vent-to-atmosphere response
• Designed to provide blow-off sound without common drivability issues on sensitive MAF-based systems
• GFB states up to 30% faster boost recovery on gearshift than traditional factory bypass valves
• 100+ psi boost holding capability per manufacturer product data
• Direct bolt-on fitment for listed factory bypass valve locations
• Machined performance valve construction for repeated turbocharged use
• User-adjustable discharge bias without changing springs or swapping valves
• Suitable for street and performance-oriented Subaru turbo setups

Specifications

• Part Number: T9000
• Brand: Go Fast Bits
• Product Line: Respons TMS Direct Fit
• Product Type: Hybrid blow-off valve / diverter valve
• Adjustment: Adjustable venting bias / sound control
• Boost Holding Capability: 100+ psi
• Mounting Style: Direct-fit OEM replacement
• Fitment Position: Factory bypass valve location
• Vehicle Platforms: GC/GF/GM Impreza, BE/BH Liberty/Legacy B4, SF/SG Forester
• Drivetrain Compatibility: AWD

Included Components

• 1x Go Fast Bits Respons TMS blow-off valve
• 1x Application-specific installation hardware package
• 1x Installation instructions

Product Description

The Go Fast Bits T9000 Respons TMS is a direct-fit hybrid blow-off valve designed for selected Subaru turbo models using the factory bypass valve mounting location. It features GFB's patented venting bias adjustment system, which allows you to control how much charge air is recirculated and how much is vented to atmosphere. This gives you adjustable sound and response while helping avoid the stalling, backfiring, and rich-running behavior often associated with fully atmospheric valves on MAF-based Subaru applications.

This valve is intended for enthusiasts upgrading the factory bypass valve on 1999-2000 Impreza WRX/STI, 1998-2002 Liberty/Legacy B4, and 1998-2004 Forester GT/XT models listed above. It is a direct bolt-on performance upgrade for AWD turbo Subaru platforms covered by GFB's T9000 application guide. This is not a lift or lowering product, so no front/rear height change applies. Fitment is confirmed by GFB's official product page and installation instructions, and cross-validated with trusted retailer listings. Fitment confirmed through 2004 for Forester and through 2002 for Liberty/Legacy B4. 2005-2025 coverage is unconfirmed at time of listing.