Afternoon Steve,
Not here to help, more to absorb the information you get from other members.
When I remove my bumper to fit Headlamp Washer Bumper (once painted) I too am looking to upgrade the sound of the horn.
I have 2 pairs of Bosch Fanfares to wire in, of course only fitting 1 pair. I have a pair from an A8 and a pair from an A6. The connectors from each donor car are different, I guess one of them will be the same as the A2s connector. Hopefully it’ll be a simple case of plugging in the pair that has the correct connector and then locating both hi and low horns. I’m not planning on fitting an additional relay. I’ll be using what ever relay already exists.
I do understand that I’ll be asking the existing relay to do twice as much work but should be on as it’s not something that is active for long periods. In most cases it’ll only be used once a year at MOT time. I just want to have the peace of mind that if I do need to get someones attention, for what ever reason that may be, they do actually hear me.
This retrofit, for me is a couple of months away as waiting to get the new bumper painted.
Please do keep us all updated (include pictures) with how you tackle this as it will of course be of untutored new and many others.
Kind regards,
Tom