Welcome to Ecomodder.
The longitudinal rails are Okay, but remove the cross-rails if possible.
As for the larger question, what are your parameters? What do you want to achieve and how much pain will you go through to achieve it?
The vehicle can be divided into drivetrain and aerodynamics; the third element being the 'nut behind the wheel'.
It being a late model there isn't a lot of 'low hanging fruit'. For instance it has spats in front of the front wheels already. To exceed the current performance would require radical lowering and lengthening. At least partial fender skirts, at least on the rear. Your belly pan will need to respect engine cooling needs.
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