Back when the cars were stiff like wet noodles, strut bars were functional. They are used to reduce the front suspension flex during hard corners. Before spending money on the strut bars tho, look to tires, shocks, springs and sway bars, they are better bang for the $$ to improve corning speed. Car these days are made so much stiffer, the added benefit of the strut bars are getting so small, most of them don't help with any meaningful speed. The TNGA platform is so much stiffer than all the older gens of Corollas, the bars become more a fashion item. If one is racing when every fraction of a second counts, this may still help.