• Basalt stainless steel insert for use with 3.5 Inch Outer Diameter Power Flow tail pipes
• Used to meet noise requirements established by the FAA
• Should be replaced if current insert is excessively worn or damaged or deforming
• Hardware pack included
• Life expectancy of 400-800 hours
Note: This product is used for all Power Flow exhausts and mufflers with a 3.5 inch outer diameter. It is not used on first generation M20 E, F, J or Cessna short stacks with a 3.0 inch outer diameter tailpipe. Those systems use a PFS-8310 replacement cone.