SL/R230: SL600 spoiler
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MBWorld Fanatic!
But i do have to warn you, the CF might turn yellow due to UV rays. That might not be good. Anyways, i will check the price for you. Honestly speaking all of the vendors have tested their spoilers/lips/bumpers before selling it to the public. Hence, best aerodynamically, i do not really know for sure? Maybe Brabus?