Learn to work on the car yourself, trust me you'll want to learn. These cars are a major pain, I've owned about 6 so I should know. They are sometimes picky and seem like they have a life of their own. Forget the turbo timer because it won't give you any sort of hp gain. Before buying any parts research on the car, there's so many parts and paths you can take. It's hard sitting here and telling you what to do unless you set a horsepower goal... 300hp... 400hp...?

There's basic bolt-ons that are cheap and will give you more hp, there's also some free mods that will be beneficial. I say you research and set a horsepower goal before buying any parts.