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Actually, I'd say torque boxes add more support than sub frame connectors. Reason being that the torque boxes tie all the subframe structure into the rocker panel, which is a very large, boxed structure that runs the length of the passenger compartment. This creates a very rigid perimeter frame that ties together all the main structural components of the uni-body, unlike a sub-frame connector that supports only the sheetmetal structure of the floor pan to the front and rear frame rails. In a number of my race cars we bypassed traditional sub frame connectors altogether and have gone with a X brace diagonally tying together the torque boxes under the floor pan.Together, however, they are a unbeatable combination.
