I think it's supposed to hold up to 14 psi, but mine began to leak around 10psi boost. It's good for a stage one turbo kit, but not for higher boost setup. I'm not an expert, but this is what I experienced with my 3000GT bov.
___________ Kon C
"Sometimes, a man has to do what a man has to do."
The blow-off sound isn't very loud; it's noticeable when you are close to it, but it doesn't compare to any aftermarket piece. I think even a 1G BOV is louder, and a lot better.
___________ Kon C
"Sometimes, a man has to do what a man has to do."