Although the U.S. A3 and the S3 shown at the Paris Motor Show share similar engine configurations, both being turbocharged 2-liter four cylinders, Audi squeezes more power from the S3's engine through the use of a larger turbo and other engine refinements. The S3 produces 265 horsepower where the A3 does 200 horsepower. The S3 with the S-Tronic transmission gets to 62 mph in 5.5 seconds.
Photo credit: CBS Interactive