Noisy interior? Welcome to Miata-dom. This won't make it silent, but it's a huge step in the right direction. This is a custom, pre-cut (aside from the tape, which is easy to cut to length) kit from our friends at DEI that provides the right amount of Boom Mat. Boom Mat is a premium quality sound damping material that keeps interior panels from vibrating and generating noise by trapping that noise between an asphalt-free butyl lower layer and a 40 mil (.004" / .1mm) thick aluminum top skin (.080" / 2mm thick in total). Since Boom Mat doesn't need to cover the entire area to do its job, you spend less money and add less weight (6.0 lbs in total) to get the job done. This kit addresses the floor, rear bulkhead, and the various pieces on the package shelf. Includes instructions to show exactly where to apply it, and even includes a roller to be sure it's properly formed and adhered.