BMW Stealthboxes come with the perfect subwoofer solution for your vehicle. BMW Stealthboxes are built with the best possible fit in mind for your BMW. They are the perfect combo of a great product and design. JL Audio Stealthboxes take up less room than a traditional subwoofer box while still providing remarkable bass. When matched with the proper amplifier the subwoofer begins to create remarkable bass and sound quality. JL Audio engineers do extensive testing to match the perfect subwoofer with their form fitted molded boxes. When you purchase from Audio Express you are getting a trusted product from a trusted company that has been is business since 1974.