Munch is correct.
The 24mm hollow Aussie Bar, even though it is slightly larger in diameter than the solid batt bar, yields the same torsional momeny of inertia, which is directly proportyional to torsional rigidity, as the 22mm solid bar, whilst making the Aussie bar even LIGHTER than the STOCK SVT rear sway bar!
This is because the torsional rigidity is directly proportional to the radius taken to the 4th power (R^4), so what this means is that the center 2/3 of the bar is really insignificant as far as stiffness goes, compared to the outer 1/3 of the bar's radius.
