Answer: If your catalytic converter ever failed, your vehicle would emit noxious gases, such as carbon monoxide, that can harm your passengers. If you have ever heard a vehicle driving down the road without a muffler, you know how loud your vehicle would be if your muffler were damaged. Not only would your vehicle be polluting the atmosphere with harmful gases and loud noises, but also your vehicle would never pass an emissions test. Also, if any of your exhaust system’s pipes were leaking, harmful gases can be released into the atmosphere. This is why it is important to check your center exhaust section periodically and replace parts when necessary.