Launched in 2003 as a replacement for the Mazda 626 and Millenia mid-size sedans, the Mazda 6 was a decidedly sporty alternative to the somewhat-bland competition. Not only were the Mazda 6 sedans, and later hatchbacks and wagons, freshened up with sleek, aggressive designs that spoke to their sporty nature, but they were also more powerful and more nimble than the cars they replaced.

Initially the four-door Mazda 6 was available in two configurations. Under the hood of the base 6i sedan was a 160-horsepower, 2.3-liter inline four-cylinder engine, while the Mazda 6s sedan was equipped with a 3.0-liter V6 that pumped out 220 horsepower.

In 2004, hatchback and wagon versions were added to the Mazda 6 lineup. In 2005, a Grand Touring trim package made its appearance, while in 2006 a Grand Sport trim package was introduced.

By the 2007 model year, the Mazda 6 was available in four different basic styles, including the original Mazda 6 four-door Sports Sedan, as well as a 5-Door Hatchback, a Sport Wagon, and the high-performance MazdaSpeed6. The high-end MazdaSpeed6 came with a turbocharged 2.3-liter double-overhead-cam four-cylinder engine, which produced 270 horsepower.

Throughout its run, the Mazda 6 received high praise and high marks from both drivers and critics, who liked the vehicles for their sporty styling, peppy engines, extensive interior appointments, solid handling, and overall good value.