FYI, you can buy a preped mustang from the factory
http://www.fordracingparts.com/mustang/competition5.asp
I don't see Nissan or any other Japanese company doing that. Mustangs, Camaros, Challangers etc.. have been road racing longer than all the Jap junk has. Trans-Am racing for starters, cars like the AAR Cuda, the Boss 302, the Z-28 Camaro w/ 302. Just adding fuel for the anti-American crowd.