shaz, unless your car is already fully fitted with electric adjustable and heated seats already (99% don't) then a wiring loom IS required, as well as a new heater control panel with heated seat controllers if they are heated.
My quattro sport only had electric lumbar support fitted, so I had to go through this process.....
The RS4's were a bargain, but it was for front seats only, nothing else, and in platinum silver (looks cream)....