Folding mirrors retrofit

[Sams4]

Hi all

I have a b9 S4 and want to retrofit the mirrors as I can get new ones for 500ish and a switch for £50. What I wanted to know is do I need any other electrical components or coding? The option for folding mirrors is on my infotainment unit it just doesn't do anything when selected

Thanks

P.s anyone had anything else retrofitted that's not extortionate?

[Steve Q]

I'd recommend you speak to autologics or Audi retros. Members have used them with great success. 

With some Audi's the coding just needs to be applied however on others, you'll need the motors, wiring harness and have it coded.