- Custom Sierra cat-back exhaust. - The price is very negotiable, I won't disagree with anyone. - It is sound and free of defects, and there is a full video of the condition of the cat-back and the Y-pipe. It fits models from 2016-2018. I don't know if it fits older models. I bought it with the car. Whoever is serious can give me their offer. May God bless us all. Location: Dammam.