As far as modifications go, this one surely has to be one of the easiest to accomplish. I was left with so much extra time on my hands that I decided to shoot some video as well. The process was so short that while I took a picture of the time on my sport chrono clock to show the start time, it was over so fast that I didn't think taking an end time shot was even relevant. Yes, really it's that easy.
So what does this part do? It stops that annoying cavitation effect that you get when you roll only one window down, in this case on a 981 Cayman GT4 but it is applicable to several new Porsches (see AWE's website for a complete list - link below). What happens is that when you roll the window down the pressure differential between the outside air and the inside of the cabin causes a resonance or pulsing of the pressures as they try to equalize that is downright annoying to the ear drums. There are a couple of ways you can alleviate or greatly diminish this effect and the method employed by the AWE Tuning Foiler is to disrupt the airflow over the side window and break up the pattern that causes the annoying sounds.
Although I did capture video of the pulsing effect prior to installing the AWE parts I found it difficult to capture on video as I suspect microphones are tuned to cancel out some of these effects naturally whereas our ear drums cannot. I certainly spent more time trying to capture it on video than I did actually installing the product.
The rest of the Article, Pictures and Video can be found here: AWE Tuning Foiler Install Article