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The kit the OP asked about is for power steering cooling and those components are flush to the underbody. The ZL1 brake cooling diverters are also flush to the control arm. The much bigger SS brake cooling diverters, which many ZL1 owners install, do hang down and mine regularly hit objects, but it's a flexible plastic panel and it simply deflects. Mine have some scratches on them but otherwise in perfect working condition. And if I do break one, the kit from GM is about $40.
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