Engine modding isnt like playing with Legos, in that you dont just change a few pieces and still have equal reliability. Modding up to a turbo properly encompasses alot of upgrading, meaning time and money. Alot of people here save alot by having the skillset to do alot of the install themselves.
Youll hear and read some people keeping stock internals and never fulling pushing the engine, but if youre not automotively incline then you really wont know what that point is. Therefore, research your butt off for a long time before making a choice on whether or not you should install a turbo.