2013 BMW M3
With the upcoming M3, BMW is looking to make the most significant changes right under the hood. Like all the other cars on this list, the new M3 will feature a turbocharged engine, but instead of using the thirsty V8 from the last M3, BMW will be returning back to its roots with a new inline six-cylinder engine.
Expect the new six-cylinder to be at least twin-turbocharged, and there have been rumors about an electric turbo to make its way into the new M3 as well. Power will likely be around 450-hp with plenty more torque than the current car, and will be mated to a six-speed manual, or a seven-speed dual clutch automatic transmission.