I have never personally used OBX parts, but have read on different forums that they have quality and fitiment issues. I have learned during my build when it comes to parts you get what you pay for, a little extra for a more expensive part is going to be worth it when you go to install it and everything lines up like it should.
I wouldn't go cheap on something like a BOV or wastegate, you don't want either of those malfunctioning on you.
02 Sentra Spec V - Centerforce Dual Friction, JWT Popcharger, Apexi N1 catback
91 240sx KAT - Forged bottom end, BC Stg3, Precision 6031E & a whole lot more