1999 Audi A4 vs. 2003 BMW 645
To start off, 2003 BMW 645 is newer by 4 year(s). Which means there will be less support and parts availability for 1999 Audi A4. In addition, the cost of maintenance, including insurance, on 1999 Audi A4 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 (325 HP @ 6100 RPM) has 78 more horse power than 1999 Audi A4. (247 HP @ 5700 RPM) In normal driving conditions, 2003 BMW 645 should accelerate faster than 1999 Audi A4. With that said, vehicle weight also plays an important factor in acceleration. 2003 BMW 645 weights approximately 280 kg more than 1999 Audi A4. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 1999 Audi A4 is four wheel drive (4WD), it will have significant more traction and grip than 2003 BMW 645. In wet, icy, snow, or gravel driving conditions, 1999 Audi A4 will offer significantly more control. 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.
Compare all specifications:
| 1999 Audi A4 | 2003 BMW 645 | |
| Make | Audi | BMW |
| Model | A4 | 645 |
| Year Released | 1999 | 2003 |
| Body Type | Station Wagon | Coupe |
| Engine Position | Front | Front |
| Engine Size | 1780 cc | 4398 cc |
| Engine Cylinders | 4 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Horse Power | 247 HP | 325 HP |
| Engine RPM | 5700 RPM | 6100 RPM |
| Engine Bore Size | 81 mm | 92 mm |
| Engine Stroke Size | 86.4 mm | 82.7 mm |
| Engine Compression Ratio | 9.5:1 | 10.5:1 |
| Top Speed | 215 km/hour | 250 km/hour |
| Acceleration 0-100mph | 8.7 seconds | 5.9 seconds |
| Drive Type | 4WD | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1410 kg | 1690 kg |
| Vehicle Length | 4480 mm | 4830 mm |
| Vehicle Width | 1740 mm | 1860 mm |
| Vehicle Height | 1420 mm | 1380 mm |
| Wheelbase Size | 2610 mm | 2890 mm |
| Fuel Tank Capacity | 60 L | 70 L |
