Inconel Step Ring. These are Inconel step rings that are for butt welding to one side and the other side you can slide the tubing inside or butt weld it.
Inconel Header Step Rings 2 1/8" to 2 1/2" Stainless Tubing
Inconel Header Step Rings 2 1/8" to 2 1/4" Stainless Tubing
SCHOENFELD SBC Modified 3-Step Header Pair for Small Block Chevy
MSD 8732 Multi-Step RPM Selector 2-Step Digital Plastic Black Ea
Brian Crower bc3601-INC Inconel Exhaust Valves 32mm/STD Set/8 For Subaru EJ