Wot eygo said. Now, if it had been a Corsa, you could have added almost literally hundreds to it by kitting it out with a baked bean can exhaust and painting the brake calipers red and the headlamps purple. But on an Auris? It's not quite the thing for ripping up the Tesco car park in your hoodie.
But for all that, there's a buyer for every car. If it looks a bit racy and it's tidy and the interior's good, there'll be somebody who fancies something a bit different. I wouldn't expect to get anything extra from a trade-in, though - people at an auction tend to assume that body-kitted cars have been hammered, so it might even count against you. Maybe even a local paper ad would be better? Make sure you've got some killer photos!