Made from a single length of EPDM rubber (generally used in the automotive industry for seals due to its' suitability for outdoor use), this fills the gap around the top glass roof panel on your Model 3, and helps to reduce wind noise. The result will of course vary by speed, road surface and wind speed, but also by Model 3, as the gap tolerances can be quite variable. In our Feb 2018 Model 3, testing over a period of about an hour on the same roads, in the same weather, we recorded an average reduction of 6.3db, but over the course of our tests it varied from virtually zero, to 11db. So with all of that said, your results will vary depending on many factors, but overall we think it does reduce the ambient noise in a Model 3.
Installation just takes a few minutes, no tools or expertise needed. Please watch our video for a quick overview: