I saw a quote on the wall this last weekend at the Auto Museum:
"Aerodynamics are for people who can't build engines" Enzo Ferrari
I'm pretty sure these designs are unbuilt, although the Bugatti one is presumed to have the W16 out of the Veyron.
High speeds would bring out the flaws in these styling exercises. I think they're interesting for the different ways they handle underbody airflow.
There was a
thread on the underbody that the mods spun this one out of.