I used the specs and homemade blocking plate setup some folks mentioned, but still had a lot of road noise. I added sound deadening from https://resonixsoundsolutions.com/product/resonix-solderless-custom-length-rca-cable-system/ in the doors and rear tub and it made a noticeable difference. The car’s still loud—it’s a Miata—but now I can actually hear music and phone calls without cranking the volume all the way up.