2005 Aston Martin DB9 vs. 2003 BMW 645
To start off, 2005 Aston Martin DB9 is newer by 2 year(s). Which means there will be less support and parts availability for 2003 BMW 645. In addition, the cost of maintenance, including insurance, on 2003 BMW 645 would be higher. At 5,935 cc (12 cylinders), 2005 Aston Martin DB9 is equipped with a bigger engine. In terms of performance, 2005 Aston Martin DB9 (444 HP @ 6000 RPM) has 119 more horse power than 2003 BMW 645. (325 HP @ 6100 RPM). In normal driving conditions, 2005 Aston Martin DB9 should accelerate faster than 2003 BMW 645. With that said, vehicle weight also plays an important factor in acceleration. 2005 Aston Martin DB9 weights approximately 20 kg more than 2003 BMW 645. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Both vehicles are rear wheel drive (RWD) - it offers better handling in dry conditions; in addition, if you are looking to drift, both vehicles do the job better than front wheel drive vehicles. With that said, do keep in mind that many other factors such as speed and the wear on your tires can also have significant impact on traction and control. Let's talk about torque, 2005 Aston Martin DB9 (571 Nm @ 5000 RPM) has 121 more torque (in Nm) than 2003 BMW 645. (450 Nm @ 3600 RPM). This means 2005 Aston Martin DB9 will have an easier job in driving up hills or pulling heavy equipment than 2003 BMW 645.
Compare all specifications:
| 2005 Aston Martin DB9 | 2003 BMW 645 | |
| Make | Aston Martin | BMW |
| Model | DB9 | 645 |
| Year Released | 2005 | 2003 |
| Body Type | Coupe | Coupe |
| Engine Position | Front | Front |
| Engine Size | 5935 cc | 4398 cc |
| Engine Cylinders | 12 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 444 HP | 325 HP |
| Engine RPM | 6000 RPM | 6100 RPM |
| Torque | 571 Nm | 450 Nm |
| Torque RPM | 5000 RPM | 3600 RPM |
| Engine Bore Size | 89 mm | 92 mm |
| Engine Stroke Size | 79.5 mm | 82.7 mm |
| Top Speed | 300 km/hour | 250 km/hour |
| Acceleration 0-100mph | 5.1 seconds | 5.9 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 4 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1710 kg | 1690 kg |
| Vehicle Length | 4710 mm | 4830 mm |
| Vehicle Width | 1880 mm | 1860 mm |
| Vehicle Height | 1320 mm | 1380 mm |
| Wheelbase Size | 2750 mm | 2890 mm |
| Fuel Consumption Overall | 15.7 L/100km | 11.7 L/100km |
| Fuel Tank Capacity | 85 L | 70 L |
