The first-generation S8 came to America in I believe 2001. It lasted until the last year of the body style, 2003.
There is a RS4, that is Europe only. There was a S6 Avant in 2002 or 2003, but that was replaced by the RS6 as the RS6 is much more powerful. I believe the R denotes an even more powerful version of the S, if that makes any sense.
I think ABT obtained the new S8 before it came out...but I'm not sure.
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-Zack
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