Maxhaust Soundbooster Kit For BMW I12 i8 Exhaust Simulation Sound Options W/AppThis is a brand new genuine Maxhaust Soundbooster exhaust sound modulator for a BMW I12 i8. This kit gives you a way to choose a variety of different exhaust sounds for your i8 that doesn't produce them on its own. After installation you'll download the app onto your smartphone and choose from dozens of different car types and can even change the sound output on demand. It's an exceptionally clever and dynamic kit that allows your to give your i8 a