| Common information: |
| Model: | BMW 645 Ci Cabriolet |
| Produced by | BMW |
| Year begin | 2004 |
| Car category | Sport cars |
| Country of origin car | Germany |
| Chassis type | Cabriolet |
| Drive | Rear tire dimensions |
| Car dimensions: |
| Car overall length: | 4830 mm |
| Car overall width | 1860 mm |
| Car overall height | 1380 mm |
| Car cargo space | 350 l |
| Passenger space | 4130 l |
| Wheelbase | 2790 mm |
| Seats | 4 |
| Max no. of doors | 2 |
| Car weight | 1815 kg |
| Car max weight with load | 2215 kg |
| Engine/fuel: |
| engine size | 4398 cm3 |
| Engine type | V8 |
| Engine location | Front longitudinal |
| Valves per cylinder | 4 |
| Bore x stroke | 92.0 x 82.7 mm (3.6 x 3.3 inches) |
| Fuel control | Double overhead cam (DOHC) |
| Fuel system | Injection |
| Fuel type | Gasoline unleaded 98 |
| Fuel mixed driving | 12.8 l |
| Fuel_capacity | 70 l |
| Speed / acceleration / power: |
| Top speed | 250 km/h |
| Acceleration 0-100 km/h | 6.1 s |
| Max. power | 248.1196 kW 6100 ot (332.6 l.s.) |
| Power weight ratio | 0.1367418 kW/kg |
| Max. torque | 451 Nm/ 3600 ot |
| Brakes, suspension, cooling system: |
| Front brakes | Ventilated disks |
| Rear brakes | Ventilated disks |
| Brake details | Antiblocking system (ABS) |
| Gearbox | 6-speed automatic or 6-speed manual |
| Cooling system | Liquid |
| Transmission | 6-speed automatic or 6-speed manual |