I've got a cxracing chinese BOV, identical to the one below, anyone know how to plumb it? Boost will be off wastegate spring only, no boost control, if that makes a difference. Thanks.

 

top to intake and bottom to charge pipe. that way when you let off the vacuum pulls up and the charge pipe pushes up. but when in boost both are equal and the spring holds it closed. the top stud is to preload the spring for that part.

friend of mine has one similair and it doesn't work real well.

 

I have one kind of similar, not cxracing but imported for sure, it is sitting in a box in a hundred pieces in my garage. I recommend disassembling it and inspecting it before you trust it, Mine had loose and cross threaded screws, cutting chips inside and the face seal cross threaded and not sitting flush. The Synapse that I purchased shortly afterward is working flawlessly...

 

Ya, I took it apart and it actually looks decent. I'll give it a try but no big deal if I have to replace it, it came with an intercooler kit I bought.