Some years ago, I saw a magazine article about somebody who did exactly what you're describing, Kerry. They took a Clifford manifold, sectioned it lengthwise through the middle, making a top and bottom half, then took 3/32 or 1/8th aluminum and formed dividers just like in your diagram, then welded the dividers in place and the manifold halves back together, and it worked much better. I'm a little surprised that Clifford never tried casting a divider into the manifold as a street option, but maybe that's too expensive or too difficult to do for the volume that they sell. Who knows?