Parts & Accessories Spare parts May God bless your evenings with all goodness. Cat-back for Sierra 2007-2013. Fire System 3-inch cat-back from Abu Mubarak's store, without back pressure, and the cat-back sound is beautiful. Clean usage, no overheating or throwing, and free from leaks. Used for approximately 3 months only. Cat-back price: 2200. Also available: Y-pipe for 1000.