The document discusses the top 5 exhaust system problems in Audi cars as identified by a Texas mechanic. The problems are exhaust leaks, increased engine noise from leaks, failed oxygen sensors, excess exhaust smoke of different colors indicating different issues, and strong vibrations from a failed exhaust system. It is important to inspect the exhaust system every 1-2 years to prevent problems, as rough road conditions in Texas can more easily cause exhaust system failures in Audis. Consulting a mechanic can help diagnose and address any potential exhaust issues.