i've heard this BOV before ...and i laughed so hard the first time i heard it

 

I have the Tial and under light load with the stiff spring I will get some gobble gobble. But under heavy boost it holds well and pops like crazy when throttle is shut. It does not whistle like the Blitz I had before and does not leak boost like the Blitz.

 

Realize that just because a bov emits a high pitched flutter on one car, it won't necessarily do it on yours. I have the TiAL on my supra and i only got to use it with my stock turbo before my motor went south one me. It did flutter, but it was not high-pitched. Different turbos, ic piping, boost, etc... affect how the bov will sound on each car.

 

At the moment I have the Blitz SS. It has a nice 'poosha' sound. I will probably go back to the stock valve into the airbox coz I hate sounding like a bus when I aint runing the car hard.
The upside at the moment is that I can scare people out of racing off lights. Not many FD's in scotland so people don't really know what it is. When hey hear the valve dump they tend not to want to race anymore. 'oh ! it's a turbo '.