make sure the turbo manifold is TIG-welded using SUS304 metal so it wont expand under extreme heat. It may not be strong as cast iron but it hold it places.
other kind of metal will expand and may crack easily.
recently only i find out that the boost that i had set on my HKS EVC1, which was at 1.4bar..was actually not achievable on my 1st and 2nd gear..... on 3rd ,4th and 5th yess i could achieve that...