2004 BMW 645 vs. 2006 BMW 320
To start off, 2006 BMW 320 is newer by 2 year(s). Which means there will be less support and parts availability for 2004 BMW 645. In addition, the cost of maintenance, including insurance, on 2004 BMW 645 would be higher. At 4,392 cc (8 cylinders), 2004 BMW 645 is equipped with a bigger engine. In terms of performance, 2004 BMW 645 (322 HP @ 7400 RPM) has 174 more horse power than 2006 BMW 320. (148 HP @ 4000 RPM). In normal driving conditions, 2004 BMW 645 should accelerate faster than 2006 BMW 320. With that said, vehicle weight also plays an important factor in acceleration. 2004 BMW 645 weights approximately 35 kg more than 2006 BMW 320. 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, 2004 BMW 645 (447 Nm) has 117 more torque (in Nm) than 2006 BMW 320. (330 Nm). This means 2004 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2006 BMW 320.
Compare all specifications:
| 2004 BMW 645 | 2006 BMW 320 | |
| Make | BMW | BMW |
| Model | 645 | 320 |
| Year Released | 2004 | 2006 |
| Body Type | Coupe | Convertible |
| Engine Position | Front | Front |
| Engine Size | 4392 cc | 1995 cc |
| Engine Cylinders | 8 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 322 HP | 148 HP |
| Engine RPM | 7400 RPM | 4000 RPM |
| Torque | 447 Nm | 330 Nm |
| Engine Bore Size | 92 mm | 84 mm |
| Engine Stroke Size | 83 mm | 90 mm |
| Engine Compression Ratio | 10.5:1 | 17.0:1 |
| Drive Type | Rear | Rear |
| Number of Seats | 4 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1715 kg | 1680 kg |
| Vehicle Length | 4840 mm | 4490 mm |
| Vehicle Width | 1860 mm | 1760 mm |
| Vehicle Height | 1380 mm | 1380 mm |
| Wheelbase Size | 2790 mm | 2730 mm |
| Fuel Consumption Overall | 11.8 L/100km | 6.5 L/100km |
| Fuel Tank Capacity | 70 L | 63 L |
