Mitsubishi Evo MR

[Sijray21]

yeah, they smooth out the flow of air coming off the roof.
Turbulence coming off the roof of a sedan/"3 box" style car is a significant source of drag. This is also why the wings on these cars are so big, to catch the air coming off the roof - not just for downforce.

and here I bet you guys thought it was just for looks :p

i knew they wouldn't put it on a high performance sports car outside the US for simply looks, but didn't know their actual purpose....a sports car that's strictly in the US, good possibility for $$BLING$$ for customers