One of the biggest misses of the latest Mercedes-AMG C63 and its four-cylinder engine is the sound. The four-cylinder engine might sound great in one of Benz’s lower-spec AMG cars, but in this top-tier 63, well, it just ain’t it. Fortunately, it sounds like Audi has learned from that very expensive mistake when it comes to its own C63 competitor, the B10 Audi RS5 sedan and RS5 Avant wagon.
