Description
The best-sounding BOV for your Mk5 or Mk6 GTI!
New fitments unlocked! The T9409 picks up new VAG fitments not covered by the existing T9401.
On vehicles using transverse-mounted EA113, EA888.1 or EA888.2 engines such as the Mk5 and Mk6 GTI, clearance issues prevent the T9401 from being a bolt-on fit.
The T9409 however moves the trumpet to a different position, allowing it to fit on these popular models.
Choose Your Sound…
With the removable extended trumpet, you can configure the T9409 to give you either a classic “whoosh”, or the loudest, most unique whistle sound you’ve ever heard!
… Then Tune It!
The T9409 also features adjustable spring pre-load so you can fine-tune when it blows off, and for how long. A softer pre-load allows the valve to blow off for longer and at lower engine loads. If you prefer to hear it only at higher engine loads you can use a firmer pre-load.
Direct Bolt-On Fit, No Modifications Needed, No Compromise
Remove the OEM diverter, bolt the T9409 in its place. No cutting, no modification, no issues – just sound and performance!
Is This the Right Valve for Me?
If you haven’t already checked that your vehicle is on the fitment list, do that first. (SELECT BY CAR LINK). If you can’t find your vehicle in that list, contact us!
If you get a few different valve options for your vehicle, use the guide below to make sure you’re choosing the right one for your needs:
T9409 VTA – Offers the loudest, most obnoxious and unique sound possible, as well as the classic “whoosh” (trumpet removed). Best choice if you love turbo noises and want something unique.
T9481 and T9451 VTA – Both offer the classic “whoosh” sound. T9481 includes the solenoid, T9451 re-uses the solenoid from the factory diverter. Best choice if you want to stick to the classic sound.
T9381 and T9351 DV+ The DV+ doesn’t vent to atmosphere, so it doesn’t make sound. You can hear a subtle air release if you have an aftermarket intake fitted, but otherwise it is silent. T9381 includes the solenoid and T9351 re-uses the solenoid from the factory diverter. Best choice if you don’t want attention!
Sharper throttle response, reliable boost holding
As with all GFB DV+ and VTA products, improved throttle response and boost holding are baked-in standard features.
The OEM moulded plastic diverter valve cannot match the performance of GFB’s precision CNC machined metal construction and Viton seals.
Unrivalled longevity, backed by our Lifetime Warranty
The combination of precision manufacturing, attention to detail, and robust materials mean the VTA will last a lifetime. So does the warranty!














There are no reviews yet.