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.
