Hello
I Have looked into the Active Exhaust for my 2013 A7, after loads of research decided to order a genuine cat back exhaust with the speakers from Audi dealership and have them fit it, cost Β£2008, also ordered a Kuafatec module and remote direct from kaufatec Germany which I will fit once exhaust is fitted. Only problem is 6+ weeks for exhaust delivery.
I looked at hazzydayz online they do complete package, kaufatec partners in Milton Keynes do it aswell, possibly weld speakers on, not recommended, both are slightly cheaper than the route Iβve gone but I want it looking factory fit, genuine.
There is no phone app for the kaufatec module but you can adjust/set sounds with a usb connected to the module using a laptop, there is a free software you can download from the kaufatec website. To choose different sounds use remote or tap cruise control stalk to desired sound.
Hope this helps.
https://www.hazzydayz.com/audi-active-sports-exhaust-7620-p.asp
https://www.kufatec.de/shop/en/sound-booster-pro/audi/complete-set-active-sound-incl-sound-booster-audi-a6-a7-4g
https://www.sound-booster.com/en/sets/finder.html