What must be considered regarding a vehicle's exhaust system?

The presence of a muffler is critical for any vehicle, and it is a requirement during the inspection process. A muffler serves to reduce engine noise and direct exhaust gases safely away from the vehicle, which is essential for both environmental and safety considerations. The inspection ensures that the muffler is functioning properly and is not damaged, as a faulty or missing muffler can lead to excessive noise pollution and potential dangers from exhaust fumes entering the vehicle cabin.

The other considerations regarding exhaust systems mentioned are not universal requirements for all vehicles. While some vehicles may have resonators or dual exhaust systems, these are not mandatory for inspection. Additionally, modifications to exhaust systems are permitted under certain conditions as long as they comply with regulations, making the statement that no modifications are allowed inaccurate.