What's wrong with my dual exhaust?

Hello, I would have this checked professionally to ensure all is working as designed. If there is a problem, it could be related to an exhaust restriction which could need addressed.

Rarely does the same amount of exhaust exist both so called tail pipes - this is not a true dual exhaust system .. Blocking one pipe naturally sends more exhaust out of the other .. That's normal. Agree - TESTING is required to discover the cause for your other concerns.