Welcome to HS..
You can put a greddy turbo on your car with no other mods. Maybe not the safest thing but it can be done. If you aleast get a Boost gauge, and a Exhaust Temp or A/F Gauge to make sure you arent running lean to help prevent detenation and run colder plugs then you should be able run the greddy kit at its stock boost setting just fine. As long as your cars mechanical condition is upto par.