It boggles my mind how a car's subframe is only held on by a few bolts and some rubber bushings. How is it that the bolts don't just shear off? It would seem that the forces of driving, sometimes erratic, should easily overcome the strength of a bit of metal. People have been putting in aftermarket polyurethane bushings and even solid aluminum bushings into their subframes, and I can't help but wonder how long before those bolts snap. Or if those bolts are of sufficient strength, that they tear through the car's body where the bolts are bolted in to. Actually, solid bushings seem very appealing. Maybe reducing sprung/unsprung weight would reduce forces that would otherwise cause damage on an unmodified car.