My front roof vent lid took a hike for the second time since I've owned my TC. It vibrates open while driving in spite of being tightened down and then shakes itself to pieces. This one is most like...
Another advantage to Maxxair and similar products is that they prevent the actual vent covers from deteriorating from UV light. I replaced several covers on the bathroom vent while the other two which were covered with Maxxairs are still 9 year old originals. I finally put a Maxxair on the bath vent this year.