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Probably cosmetic. My RX8 has a simple plastic cover that just gets in the way. My F150 has one with sound deadening that helps to quiet the direct injector tick.
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‘07 Mazda RX8
Past: 911T, 911SC, Carrera, 951s, 955, 996s, 987s, 986s, 997s, BMW 5x, C36, C63, XJR, S8, Maserati Coupe, GT500, etc
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