Un tuning is a car that's received treatment of one sort or another, some of it pretty fatal.

Here are a few of the examples I see on my rounds.....

Your bog standard model with black windows, alloy wheels and spoilers fore and aft.

A couple of pretty standard models, in the mating position.

A Portuguese visiting marulo who has obligingly put the word Tuning on his rear window.

A typical model, complete with marulo babe.

A rather superior, upmarket model.

A BMW Alpina saloon, enhanced by a tasteful, home-made rear spoiler.

My current favourite - a van with 3 features which identify the owner as a gypsy:- 1. the hat on the dashboard, 2. the open window which allows us all to enjoy the constant, booming Adalucian flamenco music, and 3. the 'agricultural' rear spoiler which completely negates the professional customising of the rest of the vehicle. 

Another couple of cars mating, including a yellow one. I have never known yellow cars to be driven by aggressive drivers outside Spain.