If you're bored and can stream it, the British gp has 3 mustang in the field in the GT4 class. Also has Astons, Lamborghini, Mclarens, Bentleys, BMWs etc
The way SRO is BOPing the Mustangs these days it's not worth watching GT4 most of the time. At least not if you want to see a Mustang at the front.....