You might get some small gains by making larger-radius fillets where the vertical wheel housings join the horizontal top of the body. This isn't a common concern on most cars, but I know that fillet shape is something that gets a good deal of attention paid to it on aircraft, particularly where the wings join the fuselage. And since there's some sharp-ish corners where the cockpit surround sticks up from the top of the body, you might gain a little from larger-radius corners there too.
Smooth hub-caps on the front are worth looking into, as well as the complete skirting of the rear wheels. You may run afoul of regs with the caps; most track-day outfits that I know of want hub caps and "beauty rings" removed before the car hits the track.
-soD
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