If your exhaust line is cut, broken or just rusted to the point of having holes, the sound of it will change, but also the exhaust gases won't come out from the

If your exhaust line is cut, broken or just rusted to the point of having holes, the sound of it will change, but also the exhaust gases won't come out from the back of the car but in the middle under it, and go inside the cabin very easily, you'll be able to smell it, and this might get seriously dangerous to inhale if you try to drive