How much are monthly payments on a 2012 5.0 mustang?
That depends on how many years you finance for, the interest rate, your down payment, and which one you buy. A 5.0 Mustang starts at $30,000 and goes as high as $50,000 depending which options you buy.
Keep dreaming. I suspect it's going to be lot of years before you can afford even the cheapest one.