Back before someone came along and started harping on that template, discussions ranged over Morelli's Banana car and Urban car, Luigi Colani, the Meridith Effect, and &tc.
We had a member that did what CFD analysis he could of the butt trumpet. I haven't found that post but here's the one where I posted it
https://ecomodder.com/forum/showthre...tml#post496477
The [tentative] conclusion was that it works better than a flat truncation. *another member* confirmed something similar was used by Bochum University and Morelli.
People remember the Schlorwagen but nobody tries to replicate it.