GFB - Go Fast Bits T9401 VTA Blow Off Valve with Adjustable Preload & Removable Trumpet

The GFB - Go Fast Bits T9401 VTA blow-off valve (also called a BOV or diverter valve) is a performance blow-off valve solution for Audi and VW turbocharged vehicles that have an electronic factory diverter valve. It gives you a wider choice of blow-off sounds than the stock diverter.

Key Features:

• Choose your sound: a removable extended trumpet lets you set the valve up for a classic "whoosh" or a louder, more distinctive whistle.
• Adjustable spring preload: fine-tune when the valve blows off and for how long. A softer preload lets it vent longer and at lower engine loads. A firmer preload limits the sound to higher engine loads.
• Low-profile design: an integrated solenoid is stacked in an over/under configuration. This keeps the valve compact, so it can fit where an aftermarket intake leaves little space.
• Boost-assisted sealing: the VTA design uses boost pressure to force the piston shut.

Use it to add a custom turbo blow-off sound and adjustable valve response to your setup.