Bought it a while back. Decided not to install...
Paid $75+shipping... Asking $70 OBO
It makes it 'divert' the boost release into the engine bay instead of back into the intake side of the turbo. Basically it's BOV sound without buying a BOV.
84 Rabbit L
-86 Jetta (x2), 90 Golf GL, 89 Golf, 89 Cabriolet 16v Turbo Berg Cup, 74 Beetle, 12 GTI, 01 Golf