2009 BMW M3 vs. 2006 BMW 645
To start off, 2009 BMW M3 is newer by 3 year(s). Which means there will be less support and parts availability for 2006 BMW 645. In addition, the cost of maintenance, including insurance, on 2006 BMW 645 would be higher. At 4,398 cc (8 cylinders), 2006 BMW 645 is equipped with a bigger engine. In terms of performance, 2009 BMW M3 (414 HP @ 8300 RPM) has 86 more horse power than 2006 BMW 645. (328 HP @ 6100 RPM). In normal driving conditions, 2009 BMW M3 should accelerate faster than 2006 BMW 645.
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, 2006 BMW 645 (450 Nm @ 3600 RPM) has 155 more torque (in Nm) than 2009 BMW M3. (295 Nm @ 3900 RPM). This means 2006 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2009 BMW M3.
Compare all specifications:
| 2009 BMW M3 | 2006 BMW 645 | |
| Make | BMW | BMW |
| Model | M3 | 645 |
| Year Released | 2009 | 2006 |
| Engine Position | Front | Front |
| Engine Size | 3999 cc | 4398 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 414 HP | 328 HP |
| Engine RPM | 8300 RPM | 6100 RPM |
| Torque | 295 Nm | 450 Nm |
| Torque RPM | 3900 RPM | 3600 RPM |
| Engine Compression Ratio | 12.0:1 | 10.0:1 |
| Fuel Type | Gasoline | Gasoline |
| Top Speed | 249 km/hour | 250 km/hour |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 4 seats | 4 seats |
| Vehicle Length | 4590 mm | 4830 mm |
| Vehicle Width | 1820 mm | 1860 mm |
| Vehicle Height | 1450 mm | 1380 mm |
| Wheelbase Size | 2770 mm | 2790 mm |
| Fuel Consumption Overall | 14.9 L/100km | 12.8 L/100km |
| Fuel Tank Capacity | 63 L | 70 L |
