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Hey, i saw your post and I have the same noise. If you get a copy of the B58 engine service manual, it states in there that this rattling is normal, and us due to the exhaust flap moving in to a position that helps preheat the catalytic converter quickly. Bit of a crappie noise though in my opinion, but agreed it doesn't last long.
The B58 manual is freely available by searching the internet, or I believe its on this forum too 😊
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