Supercharged 5.4-liter V8, 469 hp. Most cars on this list have received some sort of powertrain upgrade in the more recent models. Ditto the E55 AMG, although the tuning-inclined might actually prefer the old engine. While the new E63 AMG uses a high-revving, naturally aspirated V8 to crank out 507 hp, the earlier car uses a supercharger.