in 8.4 seconds and has a top speed of . US models of the 2009 Audi Q7 TDI Premium went on sale in 2009–04 with a base MSRP of $50,900 (excluding a destination charge of $825, taxes, title or dealer charges). Q7 4.2 TDI (2007–2009) The vehicle was unveiled at the 2007 Geneva Motor Show. The production version went on sale in early summer 2007. Q7 V12 TDI (2008–2012) The V12 TDI engine was "based" on the diesel technology from Audi R10 TDI race car, though both engines are completely unrelated: the bore / stroke / angle of the blocks are different and they do not share a single component. The only twelve-cylinder diesel engine used in any passenger car, it was rated at and of torque. This gives the vehicle a acceleration time of 5.5 seconds. The Q7 V12 TDI is, according to Audi, the best handling Q7 due to a revised suspension, tires and brakes. Audi claims the Q7 V12 TDI can handle a lateral acceleration of over .9 g on a skid-pad. The concept vehicle originally appeared at the 2006 Paris Motor Show. Audi had announced V12 diesel version for the US market using diesel emission treatment technology jointly developed with Volkswagen and Mercedes-Benz under the label "BlueTec". Audi cancelled the plan to federalize the Q7 V12 TDI for the US market due in part to the global financial crisis of 2008. This V12 version is no longer available for the model year 2013 in anticipation of the cosmetic and mechanical update of Q7 for 2014. The auto listing websites, mobile.de and autoscout24.de, have shown the 2012 model year availability of V12 version. Audi Q7 coastline (2008) The Audi Q7 coastline is a concept version of the Q7 V12 TDI that features an Inuit white interior with wood decoration. The design theme was inspired by luxury yachts. The vehicle was unveiled at the 2008 Geneva Motor Show. Lawsuit on the use of the letter Q In early 2005, Nissan North America Inc. filed a lawsuit against Audi over the use of the letter "Q" as a model name. Audi is using the "Q" for the designation of their quattro four-wheel drive system, used in production cars for over twenty-five years (Audi's Quattro trademark is actually an umbrella term for several types of four-wheel-drive systems developed by Torsen, Haldex Traction AB, and Borg-Warner, the latter being used in