2007 Audi A4 vs. 2003 BMW 645
To start off, 2007 Audi A4 is newer by 4 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 (325 HP @ 6100 RPM) has 128 more horse power than 2007 Audi A4. (197 HP @ 5100 RPM) In normal driving conditions, 2003 BMW 645 should accelerate faster than 2007 Audi A4. With that said, vehicle weight also plays an important factor in acceleration. 2003 BMW 645 weights approximately 60 kg more than 2007 Audi A4. 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, 2007 Audi A4, 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 170 more torque (in Nm) than 2007 Audi A4. (280 Nm @ 1800 RPM). This means 2003 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2007 Audi A4. 2007 Audi A4 has automatic transmission and 2003 BMW 645 has manual transmission. 2003 BMW 645 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2007 Audi A4 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2007 Audi A4 | 2003 BMW 645 | |
| Make | Audi | BMW |
| Model | A4 | 645 |
| Year Released | 2007 | 2003 |
| Body Type | Convertible | Coupe |
| Engine Position | Front | Front |
| Engine Size | 1984 cc | 4398 cc |
| Engine Cylinders | 4 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 197 HP | 325 HP |
| Engine RPM | 5100 RPM | 6100 RPM |
| Torque | 280 Nm | 450 Nm |
| Torque RPM | 1800 RPM | 3600 RPM |
| Engine Bore Size | 82.5 mm | 92 mm |
| Engine Stroke Size | 92.8 mm | 82.7 mm |
| Engine Compression Ratio | 10.5:1 | 10.5:1 |
| Top Speed | 238 km/hour | 250 km/hour |
| Acceleration 0-100mph | 8.2 seconds | 5.9 seconds |
| Drive Type | Front | Rear |
| Transmission Type | Automatic | Manual |
| Number of Seats | 4 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1630 kg | 1690 kg |
| Vehicle Length | 4580 mm | 4830 mm |
| Vehicle Width | 1400 mm | 1860 mm |
| Vehicle Height | 1780 mm | 1380 mm |
| Wheelbase Size | 2660 mm | 2890 mm |
| Fuel Consumption Overall | 8.3 L/100km | 11.7 L/100km |
| Fuel Tank Capacity | 70 L | 70 L |
