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So a couple of things it could be. I originally though it was the CAT but have been told that it would definitely product a fault code if it was. Other options are a blow somewhere else in the exhaust system, such as on the flange.
I'll just have to take it into an exhaust garage to check over, but I'm worried as it only happens when it's after a hard drive and quickly disappears after driving carefully. I don't want them to look at it and not be able to diagnose it!
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