Hi Buddy and welcome to ASN! If you were to add 2mm spacers, that would effectively change the offset to ET36, which would make the wheels stick out even more in the arches. I ran 8x18" ET44 BBS CK's with 225/18/40 tyres and even these rubbed slightly, so my advice would be to look at other options as those wheels you're thinking of are another 1/2" wider so would deffo rub. For 18x8" wheels, the lowest offset without any rubbing would be ET45. You could get away with a slightly lower ET if you run lower profile tyres (ie 215's), but I would say that an 8.5" rim with ET38 is a no no for the A3/S3, unless you want to do some arch work, etc. Hope this helps. Paula xx
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