Here's a thread to post GT350 videos. The first three are from the Ring testing in July 2014. Note the car with the black roof supposedly has a Boss motor in it and was there testing suspension.
Crank up the volume!
https://www.youtube.com/watch?v=7vuC0Gk1cpo&list=UUiNh73nU9grIPMhzxl38dwQ&feature=player_detailpage
https://www.youtube.com/watch?feature=player_detailpage&list=UUiNh73nU9grIPMhzxl38dwQ&v=MyLHStnfb9E
https://www.youtube.com/watch?feature=player_detailpage&v=2084XOt-Sj4
Crank up the volume!
https://www.youtube.com/watch?v=7vuC0Gk1cpo&list=UUiNh73nU9grIPMhzxl38dwQ&feature=player_detailpage
https://www.youtube.com/watch?feature=player_detailpage&list=UUiNh73nU9grIPMhzxl38dwQ&v=MyLHStnfb9E
https://www.youtube.com/watch?feature=player_detailpage&v=2084XOt-Sj4