Depends on where you live to make you turbo street legal. If you are in California, I only know of one turbo that is street legal in California and it only gives you like 40 WHP, waste of 3 grand if you ask me. Anyway, you can find a turbo that fits you stock internals, what kind of car do you have? Use google you should find every turbo for your car. If you want to get a big turbo, you need a lot of worthy internals.