audi already mounted a twin turbo to the gallardo's V10 for their "LeMans quattro" IAA show car.
petrol direct injection (FSI), twin chargers, 610 HP, 750 Nm torque.
but i doubt that this will be made available to the gallardo. 500 HP is more than enough, the car has to keep a distance to the murcielago and charging is against lamborghini's philopsophy. but then again, audi labelled keys...