Why stainless? I can think of several reasons to have a stainless exhaust, but there are two why not to have one. The first, too costly. The second, I can build my own out of regular steel tubing and did. The Flowmaster mufflers were ~$90 each, the rest of the system, less then $100 including all clamps, U and J bends and 10 feet of tube, welding gas and wire