The mighty M4 high-performance variant has an upgraded version of the 3.0-liter six-cylinder that produces 473 or 503 hp, depending on the model. BMW still offers a six-speed manual transmission ...

The mighty M4 high-performance variant has an upgraded version of the 3.0-liter six-cylinder that produces 473 or 503 hp, depending on the model. BMW still offers a six-speed manual transmission ...

The powertrain carries over unchanged, with the 230i model packing BMW's turbocharged 2.0-liter ... while the rear-wheel-drive M4 Competition makes 503 hp and 479 lb-ft. Visually, the M4 rocks ...