Audi A4 Blow Off Valves

Control the sound of your BOV "ON-THE-FLY" Go on, admit it. There are times you wish you could have that signature turbo blow off sound, but you're not prepared to listen to it all the time. GFB's Deceptor Pro II delivers just what you need ? the ability to control how loud your BOV sound is, from t...

The factory diverter valve on Polaris SxS models is made from plastic with a rubber diaphragm. It is known to rupture and cause significant boost leaks, and its "normally open" design means that part throttle boost response is always compromised. The GFB DV+ is a direct replacement diverter valve th...

Upgrade the factory diverter valve on select Audi and Volkswagen 2.0T VAG applications with the Go Fast Bits DV+ T9351 diverter valve. Designed as a direct replacement upgrade, the GFB DV+ keeps the factory solenoid and ECU control while replacing the weaker factory valve components with stronger me...

Like all valves in the DV+ family, the T9381 offers significant benefits over factory-fitted electronic diverter valves – sharper throttle response, faster boost recovery on gearshift or brief throttle lifts, improved boost holding, and unrivalled longevity. Where the T9381 differs from the T9351 ...

Like the DV+ though, it replaces the weak factory valve internals to ensure strength and reliability, especially in high boost applications. Other versions of the VTA are designed for use on cars that do not have any kind of factory-fitted diverter valve....

With its single venting outlet, the Mach 2 is configured from the factory for full recirculation (i.e. plumb back, diverter, bypass) venting for the performance-minded who just want the benefits without the sound....

If cars like yours typically suffer issues such as backfiring and stalling when using a fixed-ratio atmosphere-venting BOV, the Respons can help. By adjusting the venting bias to suit the car you can achieve a blow-off sound without having to put up with the issues. Like all GFB valves, the Respons ...

Want it loud? Quiet? In between? GFB Hybrid kits include a pair of blanking plugs that allow the valve to be configured for full recirculation venting, 50/50 (atmosphere / recirc), or full atmosphere venting....

By combining atmosphere venting with the proven performance benefits of our ground-breaking DV+, the VTA delivers an aggressive blow-off sound, improved throttle response, as well as superior boost holding and reliability. The integrated low-profile solenoid ensures a direct fit installation. With i...

The award-winning Kompact EM series Blow-Off Valves, are the world's first truly plug and play Blow-Off Valves. Simply unplug and unbolt your OEM Blow-Off Valve, and install ours in its place. No adapters, hoses or extra assembly required. All this while retaining complete OE control of the BOV's op...

The award-winning Kompact EM series Blow-Off Valves, are the world's first truly plug and play Blow-Off Valves. Simply unplug and unbolt your OEM Blow-Off Valve, and install ours in its place. No adapters, hoses or extra assembly required. All this while retaining complete OE control of the BOV's op...