I am doing an RSN-E install and want to wire in the sharkfin on my 04 S4 Avant. Someone said they werent sure if all Avants were pre wired if it didnt have nav to start like the sedans are.

Where would I look to see if the wiring is there to use and are the cables that are sold by places such as navparts long enough to reach the sharkfin on the Avant as opposed to the sedan?

Has anyone wired in their Avant and what did you have to do and what parts did you use.

Thanks.