1998.5-2018 Cummins 5.9L/6.7L Steed Speed T4 24V Exhaust Manifold Straight Turbo Flange (T424VSTR)Steed Speed Manifolds are CNC Machined from 1018 Mild Steel Billet and finished with a satin black coating of Techline, these aren't your typical cheap cast or tubular manifolds. Steed Speed engineers some of the finest manifolds on the planet. The Techline coating is capable of handling up to 1700 degrees continuously and up to 2000 degrees for short periods. Steed Speed warranties workmanship for as long as you own the manifold and a 1 year warranty