I was thinking about getting this bov, but i dont quite understand thier design. It says everywhere that it uses a second chamber to open up the valve, but the second chamber uses the same pressure as the turbo output, it just looks pointless. Could some one explian whats so special with this bov, its advantages and disadvantages, thanks.
Also, does the hks SSQV bov use the same idea? if not, how does that one differ?

 

it has one chamber for low boost and one for high boost i thing

 

that blow off valve works, but to very silent.

 

just trying to figure what i want. I noticed hks and apex dont use changeable springs. can Anyone else can explain my first question? Thanks for the replies

 

two chambers..
when you close the throttle that valve in the BOV will open up to vent the presure
if the presure is not enuf to push the spring for the high boost it will open only one
the low boost just has a less stiff spring

 

Is the apex bov similar to the design of the ssqv hks? if not, is it worth it, does it work well?