OK, this is a new thing for me with this D. While replacing my shocks today...noticed something underneath. Is the part of the exhuast (stock exhaust) right before the tailpipe, a muffler or something else? I thought the muffler was the much larger part of the exhaust much more towards the center, near the gas tank, This device right near the tailpipe has nice big hole in the top, and needs to be replaced, just wondering how much this will cost..this truck was not suppose to cost me all the money I needed to put into my 04 Ram that I traded it for. And wasnt planning to be doing all sorts of repairs.