Review on Enhance Your Vehicle's Performance with Alpha Racing Air Vortex Generator Diffuser Shark Fin 10pcs Set Kit - Compatible with Spoiler Roof Wing Pointed End Style Carbon Fiber Pattern by Rui Knain

I have a Prius and it's definitely not the most maneuverable car on the road. One of the main issues I struggled with was that the car bounced around a bit whenever I approached a large truck on the freeway, directly behind it, or in the adjacent lane. Not to the point where I lose control, but it's quite annoying. As a longtime Formula 1 fan, I think it's probably air turbulence and I could do something to disrupt the airflow and decided to give the shark fin a try. So I attached 4 pieces above the rear window. I wanted to, but never really expected it to make a noticeable difference, but figured it couldn't hurt. What do I know! The stuttering is almost completely gone. I'm no aerodynamicist, but I think I've stayed at a Holiday Inn at some point.