BMW 645Ci dimensions

In 1989 the 6 Series was supplanted by the 8 Series, but in late 2003, the 6 Series was reintroduced as a 2004 model, with coupe and convertible versions based on the BMW E63 and BMW E64 platforms, respectively. These two models are every available with either a 3. 0L (2996 cc) straight-6 making 190 Kw (258 hp DIN) at 6600 RPM and 300 Nm (221. 3 ft. lbf) of torque from 2500–4000 RPM (in the 630i) or a 4. 4 L (4398 cc) V8 making 245 Kw (333 hp DIN) and 450 Nm (331. 9 ft. lbf) of torque at 3600 RPM (in the BMW 645ci). In some markets, the convertible versions are sold as the 630i Cabriolet and the BMW 645ci Cabriolet.

The V8 in the BMW 645ci is the N62 motor, the same powerplant used in the 545i and 745i, with BMW's Valvetronic variable valve timing system. This is an all aluminum motor with 4 valves per cylinder. This 6-series comes with either a 6 speed automatic transmission or a 6 speed SMG sequential gear box. For the 2006 model year, BMW renamed the BMW 645ci as the 650i. The reason for this change was the increase in motor displacement.

Unlike that of the new 5 Series and 7 Series models, the look-and-feel of the new 6 Series has generally received a warm welcome from the BMW community—except, largely, owners and enthusiasts of the E24. The new 6 Series was developed to exterior like a shark, and really does remind you of one. The controversial "bangle-butt" back look-and-feel operates somewhat better on the shapely E63 than on other BMWs.