Peace be upon you I have Hyperflow short headers for a 2012 Sierra with a 5.3 engine, and I think it fits the 6.0 liter. The price is 1600, and the new price is 1800. And I have a new 3-inch Y-pipe, but it needs a gasket and bolts. The bolts are lost, and there is only one bolt. The head fits the stock headers but does not fit the offered headers. The flange of the Y-pipe has been modified. The price of the Y-pipe is one thousand riyals, and it is new, but the gasket is lost. Contact via WhatsApp / ( Phone number appears when clicking the contact button )