I don't know which way would work better if with the spilt or with out tha split, iam going to use a custom manifold but that's were am stuck with tha flange I"ve have to see which way is tha best..

just get a quick spool valve. or make one

all you need is to pair the runners of 1 and 4 together in one side of the turbo and 2 and 3 together in the other side hell do what i did and flip a header bottom half up its super ghetto but it works

Yea I saw your post that crazy but nice to bad I have 4-1 headers in my car, am going to try that with tha runners thank bro..