I have had the odd chat on aerodynamics with people who worked on designing jetfighters and such. my conclusions:
*Looks mean very little,
*you don't need much to alter the aerodynamics :
the small and ugly lip on the back of a audi TT added as a cure for
handling.
The ridges in a rear lights of a BWM 6XX
* Altering does not mean inproving
ground effect related aerodynamics are hard enough to get working in a wind tunnel (static that is).
but on a bouncy car you really need proper design tactics
I would think the flat bottom would work as far as drag goes, but could cause all kinds on interesting cooling issues.
A diffusor looks cool but is an art to get it to work. Just slapping a few diffusor shaped bits on a car will probably just cause weird turbulence possibly causing all kinds of grief at high speed.
are you going fast enough for long enough to expect worthwhile gains ? especially considering the basic material you are working with
I would spend the efforts on driving, suspension setup and getting more power..
"Aerodynamics are for people who can't build engines"
Enzo Ferrari
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Joost M. Riphagen