2003 Audi A3 vs. 2004 BMW 645
To start off, 2004 BMW 645 is newer by 1 year(s). Which means there will be less support and parts availability for 2003 Audi A3. In addition, the cost of maintenance, including insurance, on 2003 Audi A3 would be higher. At 4,392 cc (8 cylinders), 2004 BMW 645 is equipped with a bigger engine. In terms of performance, 2004 BMW 645 (322 HP @ 7400 RPM) has 76 more horse power than 2003 Audi A3. (246 HP @ 6300 RPM) In normal driving conditions, 2004 BMW 645 should accelerate faster than 2003 Audi A3. With that said, vehicle weight also plays an important factor in acceleration. 2003 Audi A3 weights approximately 165 kg more than 2004 BMW 645.
Because 2003 Audi A3 is four wheel drive (4WD), it will have significant more traction and grip than 2004 BMW 645. In wet, icy, snow, or gravel driving conditions, 2003 Audi A3 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. Let's talk about torque, 2004 BMW 645 (447 Nm) has 137 more torque (in Nm) than 2003 Audi A3. (310 Nm). This means 2004 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2003 Audi A3.
Compare all specifications:
| 2003 Audi A3 | 2004 BMW 645 | |
| Make | Audi | BMW |
| Model | A3 | 645 |
| Year Released | 2003 | 2004 |
| Body Type | Hatchback | Coupe |
| Engine Position | Front | Front |
| Engine Size | 3188 cc | 4392 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 246 HP | 322 HP |
| Engine RPM | 6300 RPM | 7400 RPM |
| Torque | 310 Nm | 447 Nm |
| Engine Bore Size | 84 mm | 92 mm |
| Engine Stroke Size | 95.9 mm | 83 mm |
| Drive Type | 4WD | Rear |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 3 doors | 2 doors |
| Vehicle Weight | 1880 kg | 1715 kg |
| Vehicle Length | 4210 mm | 4840 mm |
| Vehicle Width | 1770 mm | 1860 mm |
| Vehicle Height | 1430 mm | 1380 mm |
| Wheelbase Size | 2580 mm | 2790 mm |
| Fuel Tank Capacity | 55 L | 70 L |
