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there is guages of steel structurally counting on the air hitting it to maintian integrity, stauc disperse, or whtever else is hidden in ther imperfections.. A young car won't notice it for sometime. aluminum is a conductor, there is static from fuel flow, agitated by unpainted exhaust. my lessons are learned from a lightning strike on an old subaru, more than once..the same ridiculously engineered area. Aluminum was a good choice. I bet struts get squishy in the back in warmth, first thing to notice, as my guess. the openness my even be less of a drag, allowing for engine heat expansion, hitting parts that are always busy to get it out of there (exhaust, wheels, rear end)
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