Driving with exhaust system issues can range from mildly annoying to hazardous. Common experiences include loud roaring, rattling, or hissing noises, unusual vibrations, a strong smell of exhaust fumes, or even reduced engine performance. The car may feel less responsive, and fuel economy can drop. In severe cases, leaks or blockages can allow toxic gases like carbon monoxide to enter the cabin, creating a serious safety risk. The symptoms can make the car feel uncomfortable, unsafe, and inefficient, signaling that the exhaust system needs inspection.