Originally Posted by xluben
The 08+ WRX plastic BPV's are hit or miss. Some will work at 20psi and some will leak at 15psi. It's hard to tell when they're leaking. For the price, I think the Forge is well worth it for a Stage 2 car.
Mine is failing already and I'm 19psi. I only have 7K miles on mine stage 2+ now it makes a really bad noise and won't hold boost. Oh well it's getting replaced.