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Today I was driving and decided to do a pull, and when I boosted pass 15psi it sounds like someone is shooting an air compressor through a megaphone, almost as if the BPV was letting all boost through. And it will not make more than 15 lbs. can anyone help me out. 2015 WRX
 

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Today I was driving and decided to do a pull, and when I boosted pass 15psi it sounds like someone is shooting an air compressor through a megaphone, almost as if the BPV was letting all boost through. And it will not make more than 15 lbs. can anyone help me out. 2015 WRX
Check the vacuum line that connects directly from the by pass valve( it’s a smaller hose). To do this you can go from under the car or grab a flash light and from the top maneuver your hand below the charge pipe to check. I’ve heard of some of these popping off before. If your car is tuned consult your tuner to see what the issue could be.
 
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