Audi Quattro Models with Active Sport Differential

Audi’s Quattro system is a four-wheel drive system that I complained about for many years. Quattro system is a four-wheel drive but it has a tendency to force vehicle to understeer in corners. Therefore, I could not like the Quattro for ages. 
I have just checked the Audi’s website and noticed that Audi models with Quattro system can have Active Sport Differential that transfers power individually to rear-wheel and reduces the understeer effect.
If you will buy an Audi with Quattro, select Active Sport Differential too.