GFB Mach 2 Blow Off Valve – Subaru WRX (GDB) STI (GDB/GRB/VAB) Forester XT (SG) – Recirculating

GFB Mach 2 Blow Off Valve – Subaru WRX (GDB) STI (GDB/GRB/VAB) Forester XT (SG) – Recirculating

Application: Subaru WRX (GDB) STI (GDB/GRB/VAB) Forester XT (SG)
Part Type: Mach 2 Blow Off Valve – Recirculating

GFB's Mach 2 is a direct bolt-on replacement for your factory bypass valve, built around GFB's proven TMS technology to help the engine return to peak boost up to 30% faster than the standard diverter valve. If you don't need the adjustable venting bias of the Respons or Deceptor Pro, the Mach 2 delivers the core boost holding and throttle response benefits in a simpler package for your Subaru WRX or STI.

This listing covers the recirculating (plumb back) version for the WRX 01-07, STI 01-21 (covering V1-V10 generations), and Forester XT 06-08. It installs as a straight swap for the factory valve with no extra adaptors or vehicle mods required. Atmosphere venting conversion kits are available separately if you want an audible blow off sound.

Note: Forester XT fitment requires the triangle flange BOV. Diamond flange equipped vehicles will need the T9500 model instead — check your factory BOV flange shape before ordering.

Key Features

• 100% recirculating (plumb back) configuration for factory-like operation
• GFB TMS technology for faster boost recovery and improved throttle response
• Holds boost pressure well beyond factory limits
• Direct bolt-on fitment — no adaptors or modification required
• Upgradeable to atmosphere venting via optional conversion kit or hose plug

Vehicle Fitment

• Subaru WRX (GDB) STI (GDB/GRB/VAB) Forester XT (SG)

Please confirm your Subaru's model year and BOV flange type before ordering.