GM LS TURBO EXHAUST HEADERS/MANIFOLDS STAINLESS STEEL. Brand New Cal Custom GM LS Stainless Steel Turbo Exhaust Headers / Manifolds. Fits various GM LS series engines e. 304 Stainless Steel pipes, 409 flanges. Includes gaskets and v-band clamps.The header set includes 2 manifolds, 2 exhaust manifold flanges, 1 bolt & stud kit. Minor modifications may be required for fitment on certain models. If your vehicle is using aftermarket components, parts from other applications or custom-altered parts, then it is the installer's responsibility to verify fitment.