Can I install a body kit on a Ford Mustang without affecting performance?

[v8ismyheart]

Hey guys, I’m thinking about adding a body kit to my Mustang, but I’m worried it might mess with the performance. Anyone here done that? I don’t wanna end up with a cool-looking car that handles like a brick, lol. Does it affect the aerodynamics or speed? Or is it mostly for show? Also, any recommendations for good body kits would be awesome!