Yeah, his fresh castings are $225 each, $425 if you buy a pair to run 'dual dutra duals'. The price for him doing up the back half of the manifold is somewhere in between. Details are at www.dutra.org as well as www.slantsix.org there's an article on rear half manifold prep that doesn't involve welding. http://www.slantsix.org/articles/exhaust-man-mods/exhaust-manifold-mods.htm is the address for that. Looks pretty straightforward.