Turbo kits for the 2005 Ford Mustang don’t cost as much as you might think—they’re certainly cheaper than those that are available for many other models. You can find good quality turbo kits for the ‘06 Mustang for as little as $2,000.
For only a little more, about $2,800–3,000, you can get the ATP Garrett GT Tuner Twin Turbo Kit, which is a high-quality turbo that works great for the ‘05 Mustang V6.