Something like this, but replace the cone filter with a decent K&N, etc.
http://www.ebay.co.uk/itm/AUDI-A1-A...|Model:A4|Cars+Type:1.8+T&hash=item2581d266bf
I always liked the look of this, but it's mega money: http://www.goapr.co.uk/products/intake_carbonio_b6a4.html