[deathcomesarippin]

Maybe Ive been up to long and thinking to hard... but I know about the rear diffuser underneath the cars can help, but what about some vertical fins on top of the trunk lid? I got the idea because I just have bolts covering the holes where my old stock spoiler was, I could use them to support fins. Does anybody think it could do any good? I dunno if splitting up the air on that part of the car would help? The fins might make a vortex (like wiglets do on airplanes) ,I dont see how that could hurt, yet I haven't done to much research or testing. I just want to get some feedback on the idea.