Lamborghini's response to the same issue, from CEO Stephan Winkelmann, came to a similar conclusion but in a slightly different way. Winkelmann said that the DNA of the brand -- "the design of the car, the sound of the engine, the top speed and the sprint from zero to 100 kilometers per hour" -- cannot be sacrificed, else they aren't really making supercars any more, which means they're not really making Lamborghinis. And that can't happen.
Also echoing Ferrari, Winkelmann said that Lamborghini owners really only drive their cars on the weekends, and they only sell a handful of them, so "If we look at the real impact, it is close to zero." From the sounds of it, Lamborghini has no intention of messing with the sounds or sizes of its engines, suggesting only (so far) that it will look at using lighter construction techniques, such as more carbon fiber. Take that, EU.
[Source: Motor Authority]