There should be no reason an exhaust leak should be leaking like that. You probably have a hole that you dont know about in the body and its seeping through. Get the fucker on a lift and check it out. I say stop driving it for now if you have another car. If you already get headaches, you should stop as soon as possible. Just replacing the exhaust wouldnt fix it. There is another problem somewhere on the body of the car. Is it burning oil? Any funny noises?