2004 Audi A6 vs. 2003 BMW 645
To start off, 2004 Audi A6 is newer by 1 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 141 more horse power than 2004 Audi A6. (180 HP @ 6000 RPM) In normal driving conditions, 2003 BMW 645 should accelerate faster than 2004 Audi A6. With that said, vehicle weight also plays an important factor in acceleration. 2003 BMW 645 weights approximately 233 kg more than 2004 Audi A6. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2003 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 2003 BMW 645. However, in wet, icy, snow, or gravel driving conditions, 2004 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, 2003 BMW 645 (450 Nm @ 3600 RPM) has 215 more torque (in Nm) than 2004 Audi A6. (235 Nm @ 3000 RPM). This means 2003 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2004 Audi A6.
Compare all specifications:
| 2004 Audi A6 | 2003 BMW 645 | |
| Make | Audi | BMW |
| Model | A6 | 645 |
| Year Released | 2004 | 2003 |
| Body Type | Station Wagon | Convertible |
| Engine Position | Front | Front |
| Engine Size | 2496 cc | 4398 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 180 HP | 321 HP |
| Engine RPM | 6000 RPM | 6100 RPM |
| Torque | 235 Nm | 450 Nm |
| Torque RPM | 3000 RPM | 3600 RPM |
| Engine Bore Size | 81 mm | 92 mm |
| Engine Stroke Size | 77.4 mm | 82.7 mm |
| Engine Compression Ratio | 10.3:1 | 10.5:1 |
| Top Speed | 221 km/hour | 250 km/hour |
| Acceleration 0-100mph | 9.5 seconds | 6.2 seconds |
| Drive Type | Front | Rear |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1662 kg | 1895 kg |
| Vehicle Length | 4940 mm | 4830 mm |
| Vehicle Width | 1860 mm | 1860 mm |
| Vehicle Height | 1470 mm | 1380 mm |
| Wheelbase Size | 2660 mm | 2790 mm |
| Fuel Consumption | 7.2 L/100km | 8.5 L/100km |
| Fuel Consumption City | 13.8 L/100km | 16.8 L/100km |
| Fuel Consumption Overall | 9.6 L/100km | 11.5 L/100km |
| Fuel Tank Capacity | 70 L | 70 L |
