It was my impression that you had yet to buy anything. That is why I was recommending a complete designed and engineered solution.
As Kevin said, hollow is lighter per unit of stiffness. It also provides a larger surface area for the bushings to ride on and those brands also come with zerk lube fittings for the bushings, a big plus IMHO.
The Cobb also has an optional adjustable rear mount that also you to keep the end link geometry correct while moving between the different rear bar settings.
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I am a Commodore PET --- Now get off my lawn you kids...
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