You have various options depending on how much power you want to add- turbo, supercharger, build up existing engine or replace with another engine. Figure this out first and then do some research on the available options. I would recommend talking to a tuner/shop in person so they can help you detrmine what is appropriate and possible with your car. I visited several shops when I did my Mustang and found this to be the most sensible way to determine which route to take as well as to determine what the costs would be.