The attachment of a modified upper rear door hinge patch to the outside surface of a center pillar stiffener creates an energy absorbing cavity that: 1) reduces the chances that the center pillar stiffener will buckle or kink in a side impact collision, and 2) improves door mounting accuracy apart from the center pillar stiffener, and 3) improves the formability of the steel used in the manufacture of center pillar stiffeners.