Think of it as putting a higher rate spring in a sports car. It takes more weight or impact to compress the spring than a standard spring, there by increasing vehicle control by reducing roll, dive, and bounce. When we crank our torsion bars, we are taking them out of their normal range and they don't react the same as at stock ride height due in part to the new higher center of gravity creating a sensation of being undersprung. The HD torsion bars counteract this by making it harder to compress, or bend in the case of torsion bars, the springs when hitting a bump or making a turn. Putting HD torsion bars and equally stiff rear springs on a non lifted, stock VX would cause a very stiff and uncomfortable ride.
I could elaborate further, but that's the gist of it.
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