Help on 19 inch wheels!!

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....
 
You can use 235 or 225 tyres, with a bit of strech on 9" wide rims...

I use 215 on my 8" wide 19" rims...
 
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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