2001 Audi A6 vs. 2005 BMW 645
To start off, 2005 BMW 645 is newer by 4 year(s). Which means there will be less support and parts availability for 2001 Audi A6. In addition, the cost of maintenance, including insurance, on 2001 Audi A6 would be higher. At 4,392 cc (8 cylinders), 2005 BMW 645 is equipped with a bigger engine. In terms of performance, 2005 BMW 645 (326 HP @ 6100 RPM) has 173 more horse power than 2001 Audi A6. (153 HP @ 4000 RPM) In normal driving conditions, 2005 BMW 645 should accelerate faster than 2001 Audi A6. With that said, vehicle weight also plays an important factor in acceleration. 2005 BMW 645 weights approximately 335 kg more than 2001 Audi A6. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2005 BMW 645 is rear wheel drive (RWD), it offers better handling in dry conditions; in addition, if you are looking to drift, it will be much easier to do with 2005 BMW 645. However, in wet, icy, snow, or gravel driving conditions, 2001 Audi A6, being front wheel drive (FWD), will offer much better control with better grip. 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, 2005 BMW 645 (447 Nm @ 3600 RPM) has 137 more torque (in Nm) than 2001 Audi A6. (310 Nm @ 1400 RPM). This means 2005 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2001 Audi A6.
Compare all specifications:
| 2001 Audi A6 | 2005 BMW 645 | |
| Make | Audi | BMW |
| Model | A6 | 645 |
| Year Released | 2001 | 2005 |
| Body Type | Sedan | Convertible |
| Engine Position | Front | Front |
| Engine Size | 2496 cc | 4392 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 153 HP | 326 HP |
| Engine RPM | 4000 RPM | 6100 RPM |
| Torque | 310 Nm | 447 Nm |
| Torque RPM | 1400 RPM | 3600 RPM |
| Engine Bore Size | 78.3 mm | 92 mm |
| Engine Stroke Size | 86.4 mm | 83 mm |
| Fuel Type | Diesel | Gasoline - Premium |
| Drive Type | Front | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1560 kg | 1895 kg |
| Vehicle Length | 4800 mm | 4830 mm |
| Vehicle Width | 1820 mm | 1860 mm |
| Vehicle Height | 1460 mm | 1380 mm |
| Wheelbase Size | 2760 mm | 2890 mm |
| Fuel Tank Capacity | 70 L | 70 L |
