Roush, a name long synonymous with Mustang performance, has announced its Stage 3 performance package for the 2012 Mustang GT. The mandatory starting point is obviously a base Mustang GT. The complete core components package totals $16,800. Adding that to the price of a base GT brings the total to $46,795, which is certainly not cheap. But keep in mind the starting price for a Shelby GT 500 is $49,495, which makes the Roush a reasonable value proposition. However, if you really want to go crazy, you can add more than $13,000 in options to the Roush, some performance, others cosmetic. You’re looking at around $60,000 at that point. A princely sum, no doubt, but also a car with substantial performance capabilities.