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That smell is coming from your catalytic converter...there are sulphur byproducts in the cat that assist in reducing the harmful emissions that emanate from your exhaust. And burning sulphur (as most of us recall from HS chemistry) smells like rotten eggs.
Typically, it's not supposed to smell like that. It seems to me that your cat is getting clogged or has used up the last of its nine lives...
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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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