Thanks for quick replies. What I mean is not a spoiler as in Porsche 911, Mercedes SLS or also Chrysler Crossfire...
If you open the image i posted above by adding "http:" you can see what I mean. I would call it an "active diffuser", but I don't know if it's correct: a device lowers above a threshold speed as shown in the image. I'm sure it's not a high-end car...maybe a C-Segment car and not a really sporty one... but I can't remember that model
