How can I troubleshoot a faulty exhaust system in my Audi 80?

I have been hearing strange noises and seeing unusual exhaust emissions from my Audi 80. What could be causing this and how can I fix it?

One possible cause for strange noises and unusual exhaust emissions could be a leak in the exhaust system. Check for any visible holes or cracks in the pipes and connections. If you find any, they will need to be repaired or replaced.

Another potential problem could be a faulty catalytic converter. This can cause poor performance and an increase in emissions. A mechanic will need to diagnose and replace the converter if necessary.