A very muscular sedan.
In stock form, the Mercedes-Benz E63 AMG wouldn't stand much of a chance against anything in the current Lamborghini lineup. Of course, it wasn't built to be able to, but there's always some ambitious tuner out there with something to prove, and this time it's Renntech. The E63 AMG you'll see in this video has been boosted up to 850 horsepower. That's quite a bit more than the Lambo, although there is still a big weight difference.
We won't ruin the surprise of the video for you, but suffice it to say, it is pretty close.