Audi Car Stereo Upgrade The owner of this 2007 A4 Quattro needed an Audi car stereo upgrade. His commute to work was very unpleasant with a non-working factory radio. The customer needed something with a beautiful display with an easy to use touch screen. He also needed Bluetooth for hands free calling and little bit of that sweet HD radio Sound. We had the best solution for them in the Kenwood car stereo model DDX794. This car stereo has all the modern features like built-in Bluetooth, built-in HD radio, CD, DVD, and AM/FM. It also has a great display screen for a video feed like a backup camera. You can also add SiriusXM to the DDX794 later if you want. You really can’t go wrong with an upgrade like this. This Audi car stereo upgrade was installed by the pros at Audio Express 1235 South Gilbert Road Mesa, Arizona 85204 480-545-5202. Your local car audio experts. We can help you with a stereo upgrade to fit your vehicle and budget.