I was just attempting to boost leak test my bmw tonight. I have a pure stage 2 and my car is not hitting full boost. It's supposed to be 22 psi but I'm at 14-16psi at the top of a 4th gear pull, boost is inconsistent and it spikes a bit after I let off.
I removed that pipe by pulling it towards the passenger side while prying the main 3 visible clamps up gently using a pick. Once those 3 were lifted still applying a light pull I pried the bottom clip down and pulled the hose out.
My only issue now is plugging those 2 holes, I tried getting pressure but got leaks past the inlet seal on that valve cover hose.
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