Can I adjust the sound of the blow-off valve?

Yes, the GFB Hybrid TMS valve is designed for adjustable sound. It comes with blanking plugs that allow you to configure it for full recirculation, a 50/50 mix of recirculating and atmospheric venting, or full atmosphere venting for the loudest sound.

Will this valve cause issues with my car's airflow meter?

No, this valve is specifically designed to be used on cars with sensitive airflow meters. Its dual-venting design helps manage boost effectively, reducing the likelihood of issues like stalling or backfiring that can occur with some other blow-off valves.

What is TMS technology?

TMS stands for Turbo Management System. On this valve, it helps to recover boost more quickly after you shift gears, potentially improving the car's responsiveness.

GFB HYBRID TMS Dual Port 01-07 Subaru WRX / 05-08 Forester XT

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Specifications

Brand: Go Fast Bits
Part #: T9203
UPC: 9328022002774

GFB HYBRID TMS Dual Port 01-07 Subaru WRX / 05-08 Forester XT

Name: GFB HYBRID TMS Dual Port 01-07 Subaru WRX / 05-08 Forester XT
Brand: Go Fast Bits
Price: 234.81 USD
Availability: InStock

$234.81

On Backorder — Expected to ship by Apr 5, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2002-2014 Subaru Impreza. GFB Hybrid TMS Dual Port blow off valve offers adjustable sound and improved boost recovery.

Key Features

Fits 2002-2014 Subaru Impreza, 2001-2007 Subaru WRX, 2015-2020 Subaru WRX STI, and 2005-2008 Subaru Forester XT.
Dual outlet design combines recirculating and atmospheric venting.
Includes blanking plugs to configure for full recirculation, 50/50 mix, or full atmosphere venting.
TMS technology helps achieve up to 30% faster boost recovery after gearshifts.
Staged venting outlets allow for adjustable sound levels from quiet to loud.
Designed to work with sensitive airflow meters, reducing the risk of stalling or backfiring.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Fits these vehicles

Subaru Forester 2005-2008
Subaru Impreza 2002-2014
Subaru WRX STI 2015-2020

Product Details

Go Fast Bits is known for making well-built performance parts for enthusiast vehicles. Their Hybrid TMS Dual Port valve is a popular choice for Subaru owners looking to fine-tune their car's blow-off valve sound and performance. This valve combines recirculating and atmospheric venting, which is a smart way to manage boost on cars with sensitive airflow meters, helping to prevent issues like stalling or backfiring while still giving you that satisfying blow-off sound.

What makes this valve unique is its staged venting design. At low valve lifts, most of the air is recirculated, keeping things quiet. As you drive harder and the valve opens more, it exposes more of the atmospheric vent for a louder sound. Plus, GFB includes blanking plugs so you can easily set it up for full recirculation, a 50/50 mix, or full atmospheric venting to get the exact sound you want. The TMS technology also helps recover boost up to 30% faster after a gearshift, which can make a noticeable difference in how the car feels when you're driving it hard.

This is a direct fit, bolt-on part for many popular Subarus, meaning installation is straightforward. If you're looking to customize the sound of your blow-off valve and potentially improve boost response, this Hybrid TMS valve is a solid option.