The launch of the muscular, lightning-fast MAZDASPEED6 sport sedan in 2006 followed the introduction in the U.S. of other tricked-out high-performance MAZDASPEED cars, including the 2003 MAZDASPEED Protege and the 2005 MAZDASPEED MX-5 Miata. Based on the Mazda6 Sport Sedan, the MAZDASPEED6 kicked up the performance factor a notch thanks to a turbocharged 2.3-liter double-overhead-cam four-cylinder engine with direct gas injection, which delivered fuel directly into each chamber. As a result, the engine produced an impressive 270 horsepower, as well as extra torque for plenty of pedal off the mark. The exterior of the MAZDASPEED6 featured an enhanced front end with a sculpted hood that subtly rose to provide room for the engine's top-mounted intercooler, and an air duct for the intercooler integrated into the front grille. In the rear, a spoiler and more aerodynamic bumpers provided a more aggressive look. Inside, standard features included high-bolstered front bucket seats, automatic climate control, front side window demisters, power door locks, leather-wrapped steering wheel and shift knob, alloy pedals, and a Bose seven-speaker audio system. The MAZDASPEED6 was available in Sport and Grand Touring trim packages. To the standard list of features, the Grand Touring package added leather seats (heated in the front), leather door trim, dual power heated mirrors, an advanced keyless entry system, electroluminiscent gauges, and a power moonroof. As might be expected, the MAZDASPEED6 received high marks from both drivers and critics, some of whom called the car nothing less than impressive. Its power, handling, styling, and interior appointments were all cited as positive points.