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Audi's lineup is expanding so quickly you'd think its cars were spawning new models by mitosis. In a few days at the Paris Motor Show we'll be seeing the newest hot addition to the A1 range: the 185-horsepower 1.4 TSFI with thrust provided by a twin-charged four cylinder. That's not the S1, it just has the S-Line package thrown on for racy looks. Next year, the S1 itself will step forward, with the Golf GTI's turbocharged 220-hp engine sitting up front. It is a sure bet to shave serious time off

Audi S1 spy shots – Click above for high-res image gallery

Turning an Audi A1 into an S1 – Click above for high-res image gallery. Follow the jump to watch video.