High quality welds, fasteners and gasket material. Works great with stock exhaust on my 1993 Silverado 5.7L. The black finish it comes with is for shipping purposes only and will sting if left on. I sandblasted and cleaned mine with mineral spirits before painting it with exhaust paint. It would be a good idea to install spark plugs before these headers as I had to modify the socket to tighten the #8 plug.