Did mini me swap over winter z6 head on b7 block, turbo, and threw a rod a few weeks ago. Got stock motor (D15 sohc non vtec) back out from garage, cleaned it up, so its all stock, with a t25 garret turbo, runnin 7lbs of boost, had this set up before, ran perfect, after hooking everything back up I am getting compressor surge. I have a brand new turbo xs bov, getting good vacuum. When just driving, getting into low boost like 3psi or so, the turbo flutters, but when its at 6 lbs or so it blows off, then flutters. Any ideas? What would cause the bov not to work if it is getting good vacuum and no leaks?