2003 BMW 645 vs. 2001 BMW M3
To start off, 2003 BMW 645 is newer by 2 year(s). Which means there will be less support and parts availability for 2001 BMW M3. In addition, the cost of maintenance, including insurance, on 2001 BMW M3 would be higher. At 4,398 cc (8 cylinders), 2003 BMW 645 is equipped with a bigger engine. In terms of performance, 2001 BMW M3 (326 HP @ 7900 RPM) has 5 more horse power than 2003 BMW 645. (321 HP @ 6100 RPM) In normal driving conditions, 2001 BMW M3 should accelerate faster than 2003 BMW 645. With that said, vehicle weight also plays an important factor in acceleration. 2003 BMW 645 weights approximately 240 kg more than 2001 BMW M3.
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, 2003 BMW 645 (450 Nm @ 3600 RPM) has 95 more torque (in Nm) than 2001 BMW M3. (355 Nm @ 4900 RPM). This means 2003 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2001 BMW M3. 2003 BMW 645 has automatic transmission and 2001 BMW M3 has manual transmission. 2001 BMW M3 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 | 2001 BMW M3 | |
| Make | BMW | BMW |
| Model | 645 | M3 |
| Year Released | 2003 | 2001 |
| Body Type | Convertible | Convertible |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 3246 cc |
| Engine Cylinders | 8 cylinders | 6 cylinders |
| Engine Type | V | in-line |
| Horse Power | 321 HP | 326 HP |
| Engine RPM | 6100 RPM | 7900 RPM |
| Torque | 450 Nm | 355 Nm |
| Torque RPM | 3600 RPM | 4900 RPM |
| Engine Bore Size | 92 mm | 87 mm |
| Engine Stroke Size | 82.7 mm | 91 mm |
| Engine Compression Ratio | 10.5:1 | 11.5:1 |
| Top Speed | 250 km/hour | 250 km/hour |
| Acceleration 0-100mph | 6.2 seconds | 5.5 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | Manual |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1895 kg | 1655 kg |
| Vehicle Length | 4830 mm | 4500 mm |
| Vehicle Width | 1860 mm | 1720 mm |
| Vehicle Height | 1380 mm | 1380 mm |
| Wheelbase Size | 2790 mm | 2740 mm |
| Fuel Consumption | 8.5 L/100km | 8.8 L/100km |
| Fuel Consumption City | 16.8 L/100km | 17.9 L/100km |
| Fuel Consumption Overall | 11.5 L/100km | 12.1 L/100km |
| Fuel Tank Capacity | 70 L | 63 L |
