Thanks for your advise Lee!
The sound travels on the metal so its pretty challenging to find the source.
I haven't had a chance to crawl under the car but found the exhaust bracket in the garage. Noticed it has a bent portion at the rear side. Similar to V70-R-T5's bracket on the picture below.
V70-R-T5's picture:
TBH I haven't paid any attention to this detail when I took it off more than a year ago. So it seems got a hit by the PO at some stage.
Based on that I'll dig out the center resonator from the big pile of stuff in the garage to inspect if that has any sign of hit or scratch marks.
Also it seems the propshaft needs to be off from the car to be able to properly investigate.
To take it off and re-assemble it, do I need to buy the new bolts or the old ones can be re-used?
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