I'm think I've come to the realization that my exhaust system has been compromised. I have one muffler at the rear of the car and understand there is supposed to be another 'resonator' forward of it. Everything underneath is welded together (rather poorly) with numerous pinholes spewing exhaust at each weld. How was the system originally connected together - welded or clamped? Does it indeed require two mufflers and, if so, what is their combined function? Photos would be greatly appreciated!