The box/round front beams that Perf. uses now also have a support running inside the tube, so it is more like an I beam, round on the front but flat top and bottom, I would like to see that tested against their old round/hollow beams. I'll bet the new ones are stiffer, and torque flex less, which is why they put them on. They also must be a bit heavier because there is obviously more material there.