The part number on the catalytic convertor comes back to a 2019 Mustang GT but should work for 2018 – 2023 Mustang GT. I don’t know the full history on these but I’m pretty sure they were just pulled off for High performance upgrades. I am unable to test them though so selling as is for parts only. What you see is what you get no additional hardware or anything included. Expect surface rust and signs of use. If you have any questions just ask.