Purchased a Walker PN 18577 (from another location) as a replacement muffler for a 2003 Ford F150 Supercab V-6 when the original exhaust failed at the tailpipe/exhaust pipe joint (after 163,000 miles; not too badly damaged). As mentioned in the previous review, this muffler is shorter than stock. On my '03, the OEM muffler is 32 inches long. This replacement is 22 inch. Also, Ford eliminated the tailpipe between the catalytic converter and the muffler. For my application, the Walker PN 54129โฆ