The question is in the title.

What are the negatives of Supercharging?
Modding out a car is pretty expensive either way I was just wondering which is better? (I guess)

and how does the Supercharger work? what else would I need to buy with it so my car would be able to handle it? or can i mix it up with mods and a supercharger? or does it have to be one or the other?

(btw this is just so i can know not doing any of this any time soon)