My other car is a MINI!!!!
Depends what you're after to be honest mate.....
If you buy a milltek for an A3, the tailpipes will swan neck down from the back box, and the exits will sit totally below the bumper line.
Sad truth is, they look gash, like a cheap halfords backbox, as it's hung down there on it's own, and not 'integrated' into the car.
If you're a 'bolt ons only' kind of guy, then this is possibly your only option.
if you want it to look decent, then you need to buy a milltek with your chosen tail pipe style for a mk4 golf. These cars have an identical floorpan, but do not have the small metal valance that gets in the way, and the milltek golf system fitted to an A3 sits really nicely up inside the bumper line, and you have to cut the bumper to fit it.
it's a much more complete look, but requires a bit of effort. When I say a bit, it's probably no more than 30 minutes work to cut the bumper and the valance. hardly a tough job, you can even trim the valance with tin snips and fold it back with pliers if you don't have any other tools.