From what i understand and what others are saying its not a bov your after. Like the other guy said about taking the stock bov off and clogging the hole. This is actually bad for your turbo. That sound your askin for is compressor surge. When the throttle body closes all the boost built up has no where to go since u have no bov so it throws it back through the turbo making the chh chhhh chhhhh sound. Definately not recommend man.