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That's the code I was expecting. If the engine sounds/performs normal while running at or under the OEM boost, followed by the sound air escaping when the boost builds, it's probably just a loose connection. If you hear a throaty sound under load coming from the engine bay and a significant decrease in performance, you probably cracked your charge pipe. If the exhaust note has changed, I would start by checking the vacuum line running to the vacuum canisters, boost actuators and waste gates. Start by letting the car run for a minute or two, shut her down, wait another minute or two, then open up the vacuum line running to the brake booster (right in front of the OEM air filter). If you don't hear the vacuum release, one of your vacuum lines has a leak which could prevent the waste gates from closing resulting in the low boost and the 30FF code. Good luck and keep us posted.
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