After 21 years the factory muffler rusted. I have upgraded to a higher quality non-welded stainless steel Walker muffler and matching exhaust pipes. These parts fit perfectly on the end of the factory catalytic converter and all factory fasteners. I had to buy new rubber straps. I had to buy additional clamps. Overall, I have always had long life and accurate installation from Walker Muffler products. This is the first time I've spent more money on a stainless steel version. I'll let you know how he's held up for 21 years. Installed on a 1997 Ford 250HD with a cast iron 351W and not a new bullshit 5.4L aluminum head.