does NOT mean this is your issue, but mine was the gasket at my vsrf downpipe to the oem exhaust line.
I took the time to change the rusty bolts for stainless.
Also if you want to find the leak quickly, use soapy water in a spray. It will reveal the leak.
from the video 3, there's a darker zone around the flange, and you can see fume exhaust at the top.
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