2004 BMW 645 vs. 1999 BMW 540
To start off, 2004 BMW 645 is newer by 5 year(s). Which means there will be less support and parts availability for 1999 BMW 540. In addition, the cost of maintenance, including insurance, on 1999 BMW 540 would be higher. Both 2004 BMW 645 and 1999 BMW 540 are equipped with a 4,398 cc engine. In terms of performance, 2004 BMW 645 (328 HP @ 6100 RPM) has 46 more horse power than 1999 BMW 540. (282 HP @ 7400 RPM). In normal driving conditions, 2004 BMW 645 should accelerate faster than 1999 BMW 540. With that said, vehicle weight also plays an important factor in acceleration. 1999 BMW 540 weights approximately 81 kg more than 2004 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, 2004 BMW 645 (450 Nm) has 11 more torque (in Nm) than 1999 BMW 540. (439 Nm). This means 2004 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 1999 BMW 540.
Compare all specifications:
| 2004 BMW 645 | 1999 BMW 540 | |
| Make | BMW | BMW |
| Model | 645 | 540 |
| Year Released | 2004 | 1999 |
| Body Type | Coupe | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 4398 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 328 HP | 282 HP |
| Engine RPM | 6100 RPM | 7400 RPM |
| Torque | 450 Nm | 439 Nm |
| Engine Compression Ratio | 10.0:1 | 10.0:1 |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1690 kg | 1771 kg |
| Vehicle Length | 4830 mm | 4780 mm |
| Vehicle Width | 1860 mm | 1810 mm |
| Vehicle Height | 1380 mm | 1440 mm |
| Wheelbase Size | 2830 mm | 2840 mm |
