Click above for more high-res spy shots of the Murcielago SV

We alerted you last week to the existence of the Lamborghini Murcielago SV, a rear-wheel-drive version of the normally all-wheel-drive LP640. Seen here undergoing some on-track testing, the SV will reportedly serve up some 680 horsepower from its Lambo V12 behind the seats. It will also be lighter than a normal Murcielago by 220 pounds. Clearly visible on the car is a new fixed rear wing that's either meant to assist in take offs or stabilize the car at high-speeds. Expect carbon fiber to be a common build material, as well. Those are all some potent variables for a formula that guarantees a fun time.

The Murcielago SV will be the latest in a string of new models from Lamborghini lately including the LP640, Reventon, Gallardo LP560-4, Gallardo Superleggera, among others. We're expecting the SV to debut at the Paris Motor Show in September, but judging from the spy shots in our gallery below, it looks ready now.

Related GalleryLamborghini Murcielago SV - spy shots

[Source: Brenda Priddy & Co.]