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Cheers Arnie!
There is nothing inherently wrong with hollow. However production quality is more critical when making a hollow bar as they are less tolerant than a solid bar to material imperfections. I recall Hotchkis having lots of broken swaybar issues with their first WRX swaybars. The weight savings is indeed a consideration, that's for sure. Also for the same torsional stiffness, a hollow bar needs to be a larger outer diameter compared to a solid bar. For example, on a WRX/STi, a 22mm solid bar is equivalent in stiffness to a 24mm hollow bar. And if you want to get really, really picky, its harder to manufacture a quality hollow bar, i.e. the wall thicknesses need to be perfectly even or you get inconsistent bar rates. Ideally they should be $$$$ mandrel bent. Would your average Joe be able to notice the difference in roll resistance from a hollow bar that has minor wall inconsistencies? Most likely not. But its a consideration.
All in all, one isn't "better" than the other. Like most things, it all depends on what you value/need in your upgrade.
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