Car exhaust repair is a complex process that requires specialized knowledge and tools. The process of repairing a car exhaust can vary depending on the specific issue and the make and model of the vehicle, but generally involves the following steps:

Inspection: A professional mechanic will first inspect the exhaust system to identify the source of the problem. They may use specialized diagnostic tools to check for leaks or other issues.
Removal: Once the problem has been identified, the mechanic will remove the damaged component of the exhaust system. This may involve removing the muffler, catalytic converter, or pipes.
Replacement: If the damaged component cannot be repaired, the mechanic will replace it with a new one. Replacement parts may be purchased from the vehicle manufacturer or from a third-party supplier.
Welding or patching: In some cases, a damaged section of pipe may be repaired using welding or patching techniques. The mechanic will use specialized equipment to weld or patch the damaged area, restoring the integrity of the exhaust system.
Reinstallation: Once the repair or replacement is complete, the mechanic will reinstall the exhaust system components. They will ensure that all connections are tight and that the system is properly aligned.
Testing: Finally, the mechanic will test the exhaust system to ensure that it is working properly. This may involve checking for leaks, measuring exhaust emissions, and ensuring that the vehicle is running smoothly.