Was reading the owners manual for my '13 and the books say the largest USB size is 8GB.
Any one tried a larger key? Say 32GB?
I've been using a 32gb drive (sandisk cruzer fit) for a couple of months and it works great! I have the HK, non-nav stereo. Whenever I want to add new music to the drive I delete then recopy everything over. I have the music arranged into artist folders, with this method the folders are arranged alphabetically when browsing on the stereo. The stereo displays the folders in the order in which they were added to the drive, and this recopy method has worked out well for me. Overall I love having all of my music on the flash drive.