The MDX was unveiled in 2001, when it replaced the slow-selling vehicle dubbed the SLX which in turn, was a rebadged version of the current-at-that-time Isuzu Trooper. The MDX is offered as a seven-passenger crossover. The original MDX came with a single drivetrain, a 3.5-liter V-6 engine producing 240 hp, paired to a 5-speed automatic and AWD. Over time, the first MDX would see its power increased to 265 hp, along adding features such as voice-activated navigation system, Bluetooth connectivity, Bose audio, satellite radio, and a rear-seat DVD entertainment system. The original model performed well in crash tests and later on side-curtain airbags were added to the MDX's safety package. Even though it never reached the prestigious presence of the Lexus RX, the Acura MDX became a regular sight in upscale mall parking lots and commuter lanes due to its luxe equipment, relatively good ride and handling, and airy interior. In 2007, the second-generation MDX arrived with a significant look and feel both inside and out. It now featured a 3.7-liter V-6 powerplant producing 300 hp as well as a new AWD system. Standard equipment included a sunroof and leather trim, while options included a voice-activated navigation, high-quality premium audio package; and a rear-seat DVD entertainment system. The MDX's interior grew more spacious and useful, which made it one of the most adult-friendly cabins of any crossover, meanwhile, vehicle handling remained above-average for a crossover of its size. Gas mileage, though, was not a strong feature, at 14 mpg city, 20 highway originally and then improving to 16/21 mpg in later years this was partially due to the heavy and complicated AWD system that was arranged for this generation. The MDX was lightly refreshed in 2010, which included Acura's new and controversial corporate grille, and we found the MDX version of that design to be the best-integrated one found on any Acura. The MDX also received new electric power steering that year, but it missed the mark completely for responsiveness (it was reviewed as too fast) and heft (reviewed as too light). Safety continued to be a strong feature, as the MDX was named an IIHS Top Safety Pick. In 2010 as well, the two-door Acura ZDX was introduced, and it shared some mechanicals with the MDX. The ZDX severe lack of interior space, naturally led to very low sales, and it was withdrawn from the lineup after 2012. The Acura MDX presented little changes for 2013, the last year before the entirely redesigned 2014 model came out.