Good Morning, all!

Super happy with my recent purchase of a 2011 A4, but am finding that with all the options that were ordered on it (I have the original build sheet) they elected not to have the Bluetooth module installed. My question is this: How hard is it to find and install this module as an aftermarket addition, and will doing this harm the value of the vehicle for resell at all? This is my first vehicle from the Audi brand, and I have always been a Domestic owner in the past... I am quickly learning that Audi owners are a little more particular.

I did call the local Audi dealer and inquire about having this install done there and was given an estimate of nearly $9k. According to their service department they would have to replace all the speakers to do this?? Seemed a bit much, to me.