Took my car in to get Navigation installed...when I got it back the stereo whistled very loudly. I took it back and they said they fixed it. They had me test it with the CD player and there wasn't a whistle. However, when I switched to USB or Radio it whistled loudly again. I took it back a third time and they told me they were busy and asked if I could reschedule. Went back the following week, and they told me they thought it was fixed, but when I started accelerating away from shop it began whistling again. Three months later when I went to update the maps I couldn't find the map module. I called the shop to ask where it was installed, and they ""mistakenly"" installed it behind the stereo so I couldn't update it. These guys are unprofessional and complete amateurs. Don't waste your time because they are clueless and full of excuses for why they can't install the navigation and stereo correctly. I paid to have another shop fix the whistle and now I have to pay for the map module install.