A5 8T '12 : Concert MMI to 3G Plus Google

Hi Everyone --

I've had my 2012 A5 8T 1.8 TFSI S-Line Black Edition for about 4 years now, 60k miles on the clock and going strong.

Been giving it some love lately and installing a few bits, but the thing that I hate about this car is the MMI, the Concert one is basic bluetooth but only calls, not for audio (frustrating).

I'd like to swap it out for the 3G PLUS Google Maps - I've seen 8T versions with the cd unit, hdd, screen and gear stick surround, however...

I might be wrong but I've heard that there would need to be additional writing and upgrades to the antenna that would be needed? Is this true if so any guies or info on this.

In terms of coding this in, is it fairly simple? I've done some coding for mods and tuning lights etc, but never a new MMI unit.

Thanks in advance!