If your model is of the car I think it is, it's a beautiful design, one I would be weary of altering the exterior significantly.
2009 Alfa Romeo 159
2009 Alfa Romeo 159 1750 TBi specifications, information, data, photos 195701
Quote:
aerodynamics
drag coefficient 0.325
frontal area 2.17 mē
cda 0.71
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That coefficient of drag above almost as good as traditionally one of the most aerodynamic cars sold - see below.
1997 Porsche 911
50 Years of the Porsche 911
Quote:
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The exterior design was a reinterpretation of the 911's classic line, but with a lower drag coefficient (cW) of 0.30.
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In my opinion the traditional route in this forum of doing front grille blocks and under belly pans is the way you should go.
Perhaps the wide sporty tires the Alfa Romeo 159 runs could be substituted with something narrower to reduce the frontal area, and less sticky to improve mpg.