I want to change my alloy but i dunno the PCD and Offset for it

I tried to get that info from Audi themselves (although for a 1.8A3) without success. I think the whole A3 range is the same PCD, it is fairly easy to work out both, the PCD with a bit of maths and measuring the holes. To do the offset, rest a straight edge across the inside of the rim and measure the distance from the face which touches the hub (where the bolts come out) to the straight edge. I changed my std alloys for some Mille Miglia Spyders, imported from Germany (much cheaper there), they knew which ones to send, so if you need an absolute answer I'd ask one of the big wheel manufactures, BBS, Momo, Zender, they all have e-mail addresses. Hope this helps.

the pcd for all a3/s3/tt wheels is 5/100,as for the offset i will get that information from work tomorrow.