We recently spent an exciting couple of days in Audi’s bad-boy sedan, the 420-hp RS 4. Cars.com reviewer Mike Hanley was lucky enough to score the keys for a full-length review. He spent time on city streets and the highway, and even tossed the four-door hot rod around a racetrack. Our bright-yellow tester garnered praise for its goofy-fast acceleration and overall refinement; for all the details, check out the full writeup.