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I just bought a 15 wrx sti a few weeks ago. It has a Cobb intake and my Max boost is 17.2. last night while driving I started hearing a rattling in the intake when it's spooling up and the boost is capping at 8-9. Any ideas? It's out of factory warranty but I bought an extended warranty from the dealership.
 

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Something came loose and caused a massive intake leak
 
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