Update:
No more smell unless coming to a stop or reversing! (This is expected)
Thanks to everyone that commented.
Mechanic put some gasket sealant on the headers to block, headers to overpipe and overpipe to fp.
Seemed to have worked.
He also plugged the sound tube with silicone.
Looks like this problem is solved.
Thanks 86 fam [emoji2936][emoji2935]
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