the evo MR...... i have read the same thing, but i have also read (and the mitsu techs even agreed) those fins are more for looks if anything. i dont thing anything can be done about the rear window problem. its like a brick moving through the air and the back window is flat so it dosnt have any fast moving air passing over it so the dust/dirt/mist can settle on it. you may, however, want to try a chemical that prevents water from bonding to the glass. i use a product called "vision blade" by STP. it comes in a small blue "squegee" type applicator. its so good that if it sleets or rains then freezes all i have to do is tap my fist on the glass a few times and all the ice falls right off. also makes cleaning them 100% easyer.Avery Slickride said:A little sports sedan (a Mitsubishi I think) has vertical fins on the trailing edge of the roof to create tubulence or break the suction on the back.