I want to agree with Peter. In my case, the remapping of the ECU at 4/4 was mainly a gain in torque at medium rpm. And as Peter says, the camshafts remain the same and also the geometry of your cylinders so that it will not come to a strongly changed character of the engine. Also the new manifold will be tuned to the capacity of the engine. It would be nonsense to build the manifold in such a way that it only improves higher revs because your engine remains in its essence as it is and that should be improved.
