Hello
Those fumes where generatet by burnt oil and are not a sign from a bad exhanger. they are a sign from a oilleak wandering inside the exhanger trough a gap or a rusthole.
Exhaust gases are hard to smell only if the mixture is to rich.
Removing them is very simple by just removing the J pipes yet it sound simple but geting on that spot says use good tools and be patient.
Grüsse
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