How do I adjust the sound of the GFB Respons Blow Off Valve?

You can adjust the venting bias by simply twisting the adjustment ring on the valve. This allows you to change the proportion of air that is recirculated versus vented to the atmosphere, altering the sound from silent to a loud blow-off noise.

What vehicles does this blow off valve fit?

This valve is designed for turbocharged 1.8T engines found in many Audi, Volkswagen, and Saab models from the late 1990s to mid-2000s, such as the Audi A4, TT, Volkswagen Golf, Jetta, and Saab 9-3, 9-5. It features a 25mm inlet and outlet to suit Bosch replacement connections.

Can this blow off valve be shipped to California?

No, this product is not CARB approved and cannot be shipped to California due to emissions regulations.

GFB Audi/VW 1.8T TMS Respons Blow Off Valve Kit

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Specifications

Brand: Go Fast Bits
Part #: T9025
UPC: 9328022000862

GFB Audi/VW 1.8T TMS Respons Blow Off Valve Kit

Name: GFB Audi/VW 1.8T TMS Respons Blow Off Valve Kit
Brand: Go Fast Bits
Price: 320.85 USD
Availability: InStock

$320.85

On Backorder — Expected to ship by Apr 24, 2026

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

GFB Audi/VW 1.8T TMS Respons Blow Off Valve Kit. Adjustable venting bias helps prevent stalling and backfiring with atmospheric blow-off.

Key Features

Fits a range of Audi, VW, and Saab 1.8T models from the late 90s and early 2000s.
Infinitely adjustable venting bias allows you to control the blow-off sound from silent to loud.
GFB's TMS Technology ensures rapid boost recovery and sharp throttle response.
Can withstand boost pressures exceeding 100psi, offering robust performance.
Features a 25mm inlet and 25mm outlet, designed to suit Bosch replacement style connections.
Helps prevent stalling and backfiring often associated with fixed-ratio atmospheric BOVs.

⚠️ 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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Product Details

The GFB Respons Blow Off Valve uses a unique adjustment ring that lets you infinitely vary how much air is recirculated versus vented to the atmosphere. This means you can dial in the sound you want, from completely silent to a loud, ear-splitting blast, without causing common issues like stalling or backfiring that can happen with fixed-ratio atmospheric vents. It’s designed to work with Bosch replacement style connections, featuring a 25mm inlet and outlet, making it a solid option for many turbocharged Audi, VW, and Saab vehicles from the late 90s and early 2000s.

GFB’s TMS Technology is built into this valve, which helps ensure that boost pressure recovers quickly after a gear change and that your throttle response remains sharp. This design also means the valve can handle boost pressures well over 100psi, which is more than any factory turbocharger could produce. This robust construction ensures it can keep up with your engine's demands, providing reliable performance.

This kit is a popular choice for those looking to customize their turbo system's sound and performance. While it offers a lot of adjustability, remember that it is not CARB approved and cannot be shipped to California.