What must an exhaust system be free of?

An exhaust system must be free of leaks and holes because these issues can significantly impair the functionality and safety of the vehicle. Leaks in the exhaust system can allow harmful gases, such as carbon monoxide, to enter the passenger compartment, posing serious health risks to the occupants. Additionally, leaks can lead to reduced engine performance and fuel efficiency, as the exhaust system works effectively only when sealed properly to create the correct backpressure. Ensuring that the exhaust system is intact and free from holes is crucial for vehicle safety, compliance with emissions regulations, and optimal performance.