Setting up your 1999-2004 Mustang to include modern audio is a great way to get more enjoyment and usefulness out of your New Edge muscle car. A hands-free MP3 adapter is one of the 1999-2004 Mustang audio accessories that brings your 'Stang's audio capabilities closer to being up to date, routing any portable electronics connecting with a 3.5mm audio jack to your Mustang's radio. This enables using your Pony's speakers for hands-free cell phone and smartphone calls, playing music on MP3 players or iPods, or connecting up a satellite radio. You can also tamp down annoying road noise and vibrations with spray-on vibration dampener or peel and stick aluminum surfaced vibration dampening mats for a quieter cabin where you can appreciate the rumble of your muscle car exhaust better!