Parts & Accessories Spare parts Peace be upon you I have a full cat-back with headers that fits the Sierra from 2008 to 2013. I don't know if it fits models from 14 and above. The kit is guaranteed without leaks. The tips are rockets, and you can make it a single exit. American filter. High performance Emirati headers with laser welding. The Y-pipe and muffler are from Fox. Please do not lowball.