1.3 LITER TURBO. AWD. Catalytic cnvrtr stud. FRONT SECTION. A threaded rod which is used along with a nut to provide clamping force to help secure the Exhaust Muffler it's mounting point. Catalytic Converter Stud. Exhaust Pipe Stud. CTLTC CONV Outlet Flange. and. and bolt. Catalytic cnvrtr. Exhaust. Tail. Included with: Catalytic Converter, Front Muffler, Muffler & Pipe.