well, when i was changing my oil at a friends shop up on the lift the other night, i noticed that on my 92 325i, in the bottom of my acs muffler there are some rust holes, and my cats seemed to be stopped up....being that we have no smog laws in alabama would it hurt to have my exhaust guy run new dual pipes from the manifold all the way back to a new muffler? If i can't get a dual in dual out muffler for a decent price will it hurt to go from two pipes to one into the muffler and then two out of the muffler? thanks for any help!!