1997 Audi A4 vs. 2004 BMW 645
To start off, 2004 BMW 645 is newer by 7 year(s). Which means there will be less support and parts availability for 1997 Audi A4. In addition, the cost of maintenance, including insurance, on 1997 Audi A4 would be higher. At 4,398 cc (8 cylinders), 2004 BMW 645 is equipped with a bigger engine. In terms of performance, 2004 BMW 645 (328 HP) has 168 more horse power than 1997 Audi A4. (160 HP) In normal driving conditions, 2004 BMW 645 should accelerate faster than 1997 Audi A4.
Because 1997 Audi A4 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, 1997 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. Let's talk about torque, 2004 BMW 645 (451 Nm) has 220 more torque (in Nm) than 1997 Audi A4. (231 Nm). This means 2004 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 1997 Audi A4.
Compare all specifications:
| 1997 Audi A4 | 2004 BMW 645 | |
| Make | Audi | BMW |
| Model | A4 | 645 |
| Year Released | 1997 | 2004 |
| Body Type | Sedan | Convertible |
| Engine Position | Front | Front |
| Engine Size | 2393 cc | 4398 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 5 valves | 4 valves |
| Horse Power | 160 HP | 328 HP |
| Torque | 231 Nm | 451 Nm |
| Engine Bore Size | 81.1 mm | 92 mm |
| Engine Stroke Size | 77.5 mm | 82.7 mm |
| Drive Type | 4WD | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Length | 4480 mm | 4830 mm |
| Vehicle Width | 1740 mm | 1860 mm |
| Vehicle Height | 1740 mm | 1380 mm |
| Wheelbase Size | 2610 mm | 2790 mm |
