2014-2018 Fiesta ST FORD OEM Turbo to Downpipe "Fire Ring" Gasket
Replace this gasket/ring when removing your OEM downpipe to add a performance catless or free flow catted downpipe
many times the OEM gasket can be reused but if you want to be prepared and have a worry free seal for the NEW modification about to be installed, grab one of these for your project!
Another great idea is the ARP downpipe stud and nut kit to replace the OEM studs or bolts which are weak and break very easily. The ARP kit can be found HERE