The angled radiator is pretty common, it's to lower the center of gravity and fit a larger radiator than you otherwise would be able to given a certain height restriction.
Recall though, the MP4-12C only had radiators sitting in the sides. Supposedly to reduce the amount of piping, but I don't think they would've done it if there wasn't an aerodynamic benefit as well. In that case, they got to vent the radiators straight into the wake.
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