Or you could store your music on a card in the nav itself, and skip the adapter all together.
You can also put the music on a 64G USB stick (very small) and plug it right into the USB socket in the right fairing pocket... I quit using my IPOD adapter cable right away and switched to that. No worries about space or heat or anything.. .been solid since i did it. I've not understood why people prefer the IPOD... quality off USB seemed a bit better too (volume, etc).
i have a BMW IPOD adapter cable if anyone is interested in buying it!!!