Hanger/ Isolator Kit. Can Be Welded To Any Muffler Neck Borla Pipe Bracket Kit or Borla CrateMuffler? Bracket Kit.BORLA? Hanger Isolator Kit is designed for use with custom installations. They can be welded to any muffler neck, BORLA? Pipe Bracket Kit, or BORLA? CrateMuffler? Bracket Kit to create a clean, custom look. Kit contains (4) 5 16" diameter and (2) 7 16" diameter stainless steel rods, and (2) high temperature rubber isolators. Natural mill finish can be brushed or polished prior to installation. To see how to use these hangers check out the "How to