ok, that question was asked amillion times, so someone is not using the search button on the top. Anywyas. it is not a cake to make cars fast. YOu want to first make sure the car can withstand high speeds (atleast thats a big concern to be). So depending on ur budget, plan out what u need when u need it. There are over millions of parts to boost ur hp, its all upto what you need from your car. So unless ur more specific, thats a though one (rather newb)

also keep in mind weather and other factors. You dont want to drop a turbo in november if u live in like Maine or VT