Hyper pak exhaust manifold value

after seeing the beginning of this thread, I Googled them and there is quite a few pics on the Internet. Most of the better pics are shown on the Sl/6 Forum. I saw one(rear manifold) which looked almost exactly like the one shown by the OP. So, maybe the weld on the collector end of rear manifold is a somewhat common repair or modification. I saw many with visible casting numbers, and others without casting numbers, so maybe someone has already repopped a small run of them.