just a thought i know it wont do much but would sound pretty cool, i have a b.o.v. on my fd and see there is a brown 1 which goes back to the air filters, if i was to replace that to 1 to say a hks 1 would it work :mmmm
That 2nd one isnt a blow off valve its an air bypass for 2nd turbo leave it be.
IIRC the official name is the Charge Relief Valve. It vents boost generated whilst the secondary turbo is spooling up. You could fit a blow off valve if you wanted, but it wouldn\'t really do anything because a) the OEM one is sized to remove the flow the correct amount of air to get the secondary turbo spinning when it should, and b) the pressure to be relieved is so low you would barely get the tsssschh noise out of it anyway.
As said, much better to leave well alone and spend money on somewhere that will benefit more.
HTH
graeme