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This happen to my car when i backed up and exhaust hit parking lot cement. My issue was it caused a boost/exhaust leak which i knew where it was. I had 3 nuts in on the turbine exhaust side. If you have a wide band see what it's reading on idle, when i was driving my car sounded like an SRT-4 and louder in boost. you will also notice a power loss difference as well. If you're wideband doesn't read on idle then check all screws and make sure everything it tighten correctly on exhaust too turbo!
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