audi v8 quattro

hello. i have one question.
what is audi v8 4wheel drive.
torsen or haldex.
i know that new audi s3 have a haldex quattro. normal is fronwheeldrive, when front wheels arent go anymore well, then backwheels come help.

so... i hope that anyne underestand my question.

audi v8 have torsen or haldex AWD??