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I recently fitted the COBB stage 2+ components( new downpipe and exhaust system) and I’m having trouble with it over-boosting. I have the car on the 91 octane ACN EBCS 2+ tune but it’s still exceeding 20psi in the turbo. The tune is supposed to target 16psi. Also when I got up to that 20psi the ecu cut the file and my check engine light came on. The car is a 2005 wrx wagon. Is completely stock besides the Cobb components that I installed. What do y’all think I should do?
 

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Have you checked all the vac lines that plumb the EBCS?

Are you the original owner? It's possible that a previous owner removed the restricter pill in the vac line. Obtain a factory service manual and go through the vacuum lines checking for cracking and connection.
 
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