Ушастый запорожец

Почему ушастый? О каких ушах идет речь?
Заранее большое спасибо!!

If you google for the images of the some of the models of Zaporozhets that were produced in 1970s, you will notice the air intake ducts behind the back doors. They were sometimes colloquially referred to as "уши".

Attachment 622
Воздухозаборники для охлаждения двигателя.