Taller than a typical wagon but lower than a sport utility vehicle, the Mercedes-Benz R-Class debuted for the 2006 model year. Inspired by Mercedes-Benz's Vision GST concept design, the R-Class production car was developed during the Daimler Chrysler era in which it shared a platform with the Chrysler Pacifica. Featuring three rows of premium passenger seating, up to 85 cubic feet of storage came available inside the R-Class. For its 2006 debut, the Mercedes-Benz R-Class was available as the V-6 powered R350 or an R500 with a V-8 engine (The R500 was dropped after the 2007 model year). The second year of production for the R-Class consisted of two new trim variants. Mercedes-Benz provided the option of an R320 CDI diesel model as well as an R63 AMG. The high-performance 503-horsepower R63 AMG model existed for only the 2007 model year making it a rare version of the R-Class. In 2009, the diesel-engined R-Class incorporated a new, cleaner-operating 3.0-liter BlueTEC engine. All Mercedes-Benz R-Class vehicles sold in the United States were exclusively equipped with 4Matic all-wheel drive. Struggling to meet sales expectations, the R-Class was dropped after the 2011 model year.