2003 BMW 645 vs. 2006 BMW 535
To start off, 2006 BMW 535 is newer by 3 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 4,398 cc (8 cylinders), 2003 BMW 645 is equipped with a bigger engine. In terms of performance, 2003 BMW 645 (321 HP @ 6100 RPM) has 53 more horse power than 2006 BMW 535. (268 HP @ 4000 RPM). In normal driving conditions, 2003 BMW 645 should accelerate faster than 2006 BMW 535. With that said, vehicle weight also plays an important factor in acceleration. 2003 BMW 645 weights approximately 155 kg more than 2006 BMW 535. 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, 2006 BMW 535 (560 Nm @ 2000 RPM) has 110 more torque (in Nm) than 2003 BMW 645. (450 Nm @ 3600 RPM). This means 2006 BMW 535 will have an easier job in driving up hills or pulling heavy equipment than 2003 BMW 645. 2003 BMW 645 has automatic transmission and 2006 BMW 535 has manual transmission. 2006 BMW 535 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2003 BMW 645 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2003 BMW 645 | 2006 BMW 535 | |
| Make | BMW | BMW |
| Model | 645 | 535 |
| Year Released | 2003 | 2006 |
| Body Type | Convertible | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 2993 cc |
| Engine Cylinders | 8 cylinders | 6 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 321 HP | 268 HP |
| Engine RPM | 6100 RPM | 4000 RPM |
| Torque | 450 Nm | 560 Nm |
| Torque RPM | 3600 RPM | 2000 RPM |
| Engine Bore Size | 92 mm | 84 mm |
| Engine Stroke Size | 82.7 mm | 90 mm |
| Engine Compression Ratio | 10.5:1 | 16.5:1 |
| Top Speed | 250 km/hour | 250 km/hour |
| Acceleration 0-100mph | 6.2 seconds | 6.5 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | Manual |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1895 kg | 1740 kg |
| Vehicle Length | 4830 mm | 4850 mm |
| Vehicle Width | 1860 mm | 1850 mm |
| Vehicle Height | 1380 mm | 1470 mm |
| Wheelbase Size | 2790 mm | 2890 mm |
| Fuel Consumption Overall | 11.5 L/100km | 8 L/100km |
| Fuel Tank Capacity | 70 L | 70 L |
