Today, we have found a video of the Pagani Huayra on youtube, posted by Marchettino. The camera is mounted back of the car, next to the four exhaust pipes - the distinguishing feature of the Huayra's rear fascia - as the car roars around the track.
The video is intended to give us the track sound of the Huayra and we get that in spades here as the hypercar does a few laps around the Adria International Raceway.
[Video Youtube, Via WCF]