i assume that you will be keeping an internally wastegated turbo.
what i would do is
a:remove the internal waste gate(the diaphram that the boost line goes to and the rod) then weld the flapper.
or,
b: you might be able to upgrade the exhaust housing on the turbot o one that does not have an internal wastegate. from there you probably would go with a new turbo outlet.
my.02
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