Lightweight Audi A5 2.0T Concept ? Prototype Drive

The Biggest Loser: A four-cylinder Audi sheds 500 pounds and smokes the V-6. Taking weight out of a modern car can be tricky: Crash regulations have necessitated heavier structures, emissions laws have forced additional complexity into vehicles, and amenities have added dozens of electronic control units and untold miles of cable. Many automakers, however, are now experimenting with shedding pounds as a means to maintain performance despite the c...