We are already familiar with the new Audi S3 Sedan. Having debuted in August, its understated-yet-aggressive styling is befitting of Audi sports sedans, and its turbocharged 2.0-liter four-cylinder doles out 306 horsepower (228 kilowatts) to all four wheels. The RS3 shouldn’t look much different, but boy will it sound different. And as a result, it will most definitely accelerate differently.