You should also consider that such a car may be expensive to insure. Check your insurance rates before buying one, for example here - carquotes.imess.net
If you talking about taking a 2006 V6 Mustang and converting to a 2006 Mustang GT. It will be far, far, cheaper and easier to sell the V6 and buy the GT.
A forum community dedicated to Ford Mustang owners and enthusiasts. Come join the discussion about performance, horsepower, modifications, troubleshooting, racing, and more!