Have a look at Sabre tuning. They are getting well over that on the standard manifold. And more to the point the standard ecu.

The Rs manifold has two extra support brackets between the idle valve and the manifold bolts. Even with this you can actually see the manifold bulge under boost. There is another stiffening bracket across the injectors.

The silvertop manifold looks like the Blacktop but they are not the same the silvertop uses side feed injectors. The Rs uses a silvertop style alloy throttle body. Again this doesn’t fit the Blacktop manifold hence ford making up the adapter.

Edit don’t get the last of the Blacktop manifolds that looks like two half’s glued to gether.