I may be wrong but the correct offset for a S3 would be ET50 with a width of 8J and the correct tyre size should definitely be 235/35/19s. With a wide tyre like the one you have suggested, you are sure to have rubbing issues....
Like has been said you could have rubbing issues, the offset is OK but the tyre is a bit too wide, which would also give you the wrong rolling radius and your speedo would read too slow
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