Although Audi calls it a concept, the Q7 V12 TDI looks ready to be on sale, although not necessarily in the US. With a massive 500-bhp and 738 lb.-ft. torque output, the 6.0L V-12 turbodiesel surges from 0-100 km/h (62 mph) in only 5.5 seconds. A top speed of 250 km/h (155 mph) ensures that this Q7 can keep up with most sport sedans with ease. Bluetec(r) SCR (Selective Catalytic Reduction) technology reduces the nitrogen oxides pollutants common to conventional diesel engines.