Check them out here! https://www.centurialinc.com/exhaust-tech Exhaust header tools. These are for custom exhausts. Fabricators who make custom headers and custom exhausts know how hard it can be to get the perfect fit. When using exotic materials like titanium or Inconel and even stainless steel these mock up tools are perfect for saving time and money. When mocking up headers these fabrication tools tell you the length of the header, the rotation of the pie cuts and the angle of the pie cuts. An O-ring press fit snuggly holds it all together. Exhaust flanges are used to connect the mock up tools to the engines cylinder head. From the the fabricator making the custom headers can use trial and error to quickly get the exact fit. They are perfect for making equal length headers and even stepped headers. Merge collectors are positioned in place with a positioner. But many fabricators use temporary mounts to hold the collectors in place. Let us know what project you would use these tools for. Race car exhaust, custom race car headers, race car headers, custom headers, Ice Engine Works, SS customs.