The 2019 Audi S4 is bigger and gets a mighty, turbocharged V6 engine making 349 horsepower, so the 2019 Audi S4 is even quicker! It'll make the run from 0-60 MPH in as little as 4.4 seconds. However, the 2019 Audi S3 is lighter with a tighter turning circle and quicker steering ratio, so it's even more nimble.