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i'd exeriment with an undertray, wheeldams op perhaps an airdam.
especially an undertray is a great update to any car, as it smooths out the air going underneath, but it has the added benefit of blocking out road and windnoise, and keeping your engine bay much cleaner. subjectively i'd also say that it makes my car feel a bit more stable. everytime i drove the car without it since it was fitted it felt as though the car was less stable. could just be the noise, but it's a great thing to have.
i've once experimented with windstrips for doors to seal up the panel lines between the hood, and while i didn't see a massive FE increase from this and they didn't stand up to the rain, i'd swear the car was a little more quite, wich made it feel... smoother.
experimenting with wheel airdams i found certain setups can also alter the feel of the car... these things are difficult to get right especially since the low drag and a stable feel sometimes come from different designs.
if you want to drive a normal car hard, than the first thing you'd need to upgrade are the suspention , the breaks and the tires... these things keep you from going of the road. but keep in mind that widers tires are a huge source of aero drag
the opel calibra went from 0.26 to 0.29 because wider tires where fitted, and the new mercedes e class coupé has Cd's from 0.24 up to 0.29 depending on what size tires are fitted.
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