In late 1997, the introduction of a new A6, based on a new design automobile platform - the Volkswagen Group C5 platform, with a new range of internal combustion engines was announced. The Italian-redesigned body presented a modern design, with a fastback styling which set the trend for the Audi lineup, and gave the relatively large saloon an aerodynamic shell with a low coefficient of drag of 0.28.
As a result of complying with FMVSS, the North American models were equipped with front and rear bumpers that protruded several inches further than their European counterparts, with modified brackets and bumper suspension assemblies as result, and child-seat tethers for occupant safety.
In 2002, the A6 received a facelift, with revised headlight and grille design, exposed exhaust tips, and slight changes to accessory body moldings, and taillight colour from red to amber in North American models. A new host of engines were also introduced. The 1.8 litre engine was deleted and replaced by a 2.0 litre powerplant with 96 kilowatts (131 PS; 129 bhp). The 1.9 litre Turbocharged Direct Injection (TDI) was tweaked to produce a maximum motive power output of 96 kilowatts (131 PS; 129 bhp), and 310 newton metres (229 ft·lbf) of torque, receiving a six-speed manual gearbox in the process. The 2.4 litre V6 gained an extra 5 hp and better balancing, and the 2.8 litre V6 engine was replaced by a 3.0 litre engine with 162 kilowatts (220 PS; 217 bhp). The turbocharged 2.7 litre was revised, resulting in 184 kilowatts (250 PS; 247 bhp) and 330 newton metres (243 ft·lbf), controlled by standard quattro. The V6 diesel was also slightly modified resulting in 120 kilowatts (163 PS; 161 bhp) (after the second modification) and 350 newton metres (258 ft·lbf). A new more powerful V6 diesel was also introduced with 132 kilowatts (179 PS; 177 bhp) and 370 newton metres (273 ft·lbf). The 4.2 litre V8 engine which arrived in 2001 remained unchanged.
Source: Wikipedia, 2011