GFB’s DVX takes the extremely popular DV+ Diverter Valve and adds  dual venting outlets along with our patented Venting Bias Adjustment  System. So not only do you get IMPROVED BOOST HOLDING and THROTTLE  RESPONSE, you have total control over your BLOW-OFF SOUND VOLUME!
WHAT MAKES DVX DIFFERENT TO ANY OTHER VALVE THAT GOES “WHOOSH”?
    - The DVX is not just a noise maker (like BOV spacers) - by  modifying the valve operation method it offers the same  PERFORMANCE BENEFITS that the DV+ does.
- It retains ECU CONTROL for the fastest possible operation.
- No other blow off valve has the  advantage of GFB’s Venting Bias Adjustment, allowing you to alter the  blow off sound simply by moving the adjustment lever.
- Built to last.
GFB’s DV+ design solves the longevity and boost leaking issues that  are common with factory diverter valves, and also changes the  operation method to “pilot actuation” (read about this below) to ensure  better
performance on stock or modified engines.
Furthermore, these benefits won’t cost you the Earth! Rather than  throwing the entire factory diverter valve system in the trash (like  other manufacturer’s “solutions”), the DV+ keeps what works, and  replaces what doesn’t.
WHAT DOES IT FIT?
The T9659 is a duel venting direct factory replacement for the VW MK7 Golf R and Audi 8V S3
WHY NOT JUST USE A SPACER?
There are many “BOV spacers” on the market that make noise. However,  they do this simply by using the factory diverter valve and  redirecting the air to atmosphere. Therefore, the performance  deficiencies of the factory diverter valve design remain, and  furthermore, the flow
capacity of the factory diverter is significantly reduced because of the small venting holes used in these BOV spacers.
 ECU VS VACUUM CONTROL
Other BOV kits eliminate the ECU control entirely, using pure  manifold vacuum control instead. Whilst there’s nothing particularly  wrong with this (that’s how the majority of BOVs work), the ECU  control is MUCH FASTER, able to detect and respond to much  SMALLER THROTTLE TRANSITIONS and, since it’s available, why wouldn’t you  use it?
 WHAT’S SPECIAL ABOUT OUR VENTING BIAS SYSTEM?
GFB’s patented Venting Bias Adjustment System is the only one of its  kind in the world. By using an internal rotating sleeve, the opening of  both the recirc port and the atmosphere port can be infinitely adjusted.  This means that you’re not stuck with a fixed 50/50 or 100% atmosphere  venting ratio; you can change it to whatever you want! As an additional  benefit, because the atmosphere outlet is a single large port rather  than a series of small holes, the venting sound is much DEEPER AND  LOUDER than it is with a BOV spacer.
 THE BOTTOM LINE IS...
 The DVX offers a TRUE PERFORMANCE improvement,  INCREASED BOOST-HOLDING ability, and a blow-off sound that is  COMPLETELY ADJUSTABLE from factory-silent to ear shattering!