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It's important to note that Tesla's design team was not at a loss for a suitable front bumper design. The goal of aerodynamic efficiency led them to it. No wonder the Model S has the lowest c/d of any production car, including Ferraris and Lamborghinis. Cool-looking design is easy. Efficient design that looks good is not so easy.
IMHO It's heavy handed and ungraceful. It's totally inconsistent with Model S design and looks just like what it is: an jerry-rigged aftermarket add-on.
And the stock air inlets provide more than adequate amounts of air for driving on public roads, which is what the Model S is designed for, and larger inlets will negatively impact aerodynamic efficiency and decrease range.
Model S drag coeffecient is 0.24. Confirmed by Car and Driver, and others I believe. Most aerodynamic car on the market is not amazing? As far as I know, Mercedes numbers in that chart don't reflect the real world. Car and driver tested the CLA 250 for example, and got a drag coefficient of 0.30, rather than the 0.22 or 0.24 claimed in that wiki article.