Alfa Romeo 156

156 GTA, 2001 to 2005 The most affordable way into the Busso V6, Alfa Romeo's all-aluminum 60-degree six named after its engineer, Giuseppe Busso. In the 156 GTA it reached its largest size, 3,179 cc, making 247 horsepower in a family sedan. The 60-degree layout is compact and naturally well balanced, which is part of why the note sounds smooth and rich instead of buzzy. The Busso's fame rests almost entirely on its voice: a sharp, hollow howl that builds as it revs and that modern turbocharged sixes do not reproduce. Production ended in 2005, days after Busso himself died. The 147 GTA hatchback shares the same big-capacity engine.