"Steve Saleen discusses the Saleen FourSixteen, a modified Tesla Model S, at Saleen's headquarters."
States the video description. The audio quality isn't stellar, so you might need to crank up your speakers a bit.
Basically, Saleen is saying that his company improved the Tesla Model S in most all areas, including acceleration and aerodynamics.
For more details on the Saleen Foursixteen, check out this price/option breakdown post here.