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SuspensionSprings, struts, coilovers, sway-bars, camber plates, and all other modifications to suspension components for Cooper (R50), Cabrio (R52), and Cooper S (R53) MINIs.
Randy Webb said it was more for show. The MINI is pretty stiff with out it. But I have heard other tuners say their cars handled well after adding a strut bars.
it will add rigidity but unless you are taking your car to the track or autocrossing it chances are you won't notice a difference and it only increase the bling factor for your car.
I think it also sorta minimize the chances of getting the strut tower form ballooning when hitting pot holes (if you got stiff suspension). I could be wrong...