Vortex generators are found on the back of Mitsubishi Evo's. They improve the flow down the rear window, getting more air to the wing/lip. Would this borderline 'Ricey' mod help the poor aerodynamics of a 240/260's rear? Do they even work in the first place? I'm still reading up more and more about this as I posted this thread, so if I find something that proves that shark fins on a car do jack all, then I'll just leave it at that.
1. Vortex generators on cars can achieve measurable, scientifically proven improvements in car aerodynamics – reducing both lift and drag. The Lancer Evo is probably the shape of things to come – expect vortex generators (of whatever design) to be used on new cars, especially to improve the flow around corners towards the rear of the body.
2. Commercially available (and cheap) vortex generators like AirTabs can achieve a provable change in car aerodynamic behavior. Even a single vortex generator will alter local flow behavior, something to keep in mind when considering airflow into bonnet scoops and at specific problem areas.
3. Positive gains can be achieved only by practical experimentation. That’s the downside – the upside is that the vortex generators are easy to temporarily stick into place with masking tape, and just as easily removed if they are not achieving the desired results. They’re also cheap enough that buying ten or so for experimentation is a good investment.
4. The use of vortex generators under cars has zero visual impact and looks to have excellent potential for reducing lift without increasing drag.
[Stolen information from Autospeed.com]
Give your opinions and even better, facts if anyone is a aerodynamics engineer.