I had covid back in January and still can't smell so I cant answer that question LOL. But there is a very small amount of white smoke but only on a cold start when the weather is colder.
I put 2' kooks catless headers and a Borla ATAK exhaust on my 2015 mustang gt. This setup is not for everyone LOL. It is EXTREMELY loud but only when you want it to be. Cold starts are very loud but the car will quiet down once the car gets up to temp. Borla did a great job with their no drone...