Toyota GT 86 Wears the Skin of the Night [Video]
With such a nice stock body design you can let it as it is, or add just some discrete lower lips to the bumpers and it will be cool enough. Tinting the windows and the light covers is also a good idea and lowering its stance to ride on some big shiny rims makes it even better.
Like this black themed GT 86 down in the video. Clean shapes, multispoke rims, nothing too shouty and pretty much stock parts. The interior got a nice touch from the racing steering wheel that replaces the factory one though.