Watch the portion inside the cab, it looks like it has been gutted. If he is not running a head liner, I doubt he has much other interior in the car either. You can make a fox weigh next to nothing and its the torgue getting beating out the other cars not his 495hP
Man that guy in the fox really knows the car to lift it like that and stay in it mostly. You can tell that motor in the fox is not cheap it turns a lot of rpms it was done right.