I see in ebay and other sites, header building kits. Specify the engine and they come with the header flange plates with pre drilled, precut exhaust ports and a bunch of different bends that can be put together.
I have thought, where is the performance in that ?
The 1959 Dodge W100 Power Wagon, it has a cracked exhaust manifold. I have thought about getting one of those kits to build headers for that truck. Even though it would lack the performance, it might stop that ugly sound created from that cracked RH manifold.