2009 Audi S4 vs. 2003 BMW 545
To start off, 2009 Audi S4 is newer by 6 year(s). Which means there will be less support and parts availability for 2003 BMW 545. In addition, the cost of maintenance, including insurance, on 2003 BMW 545 would be higher. At 4,398 cc (8 cylinders), 2003 BMW 545 is equipped with a bigger engine. In terms of performance, 2009 Audi S4 (340 HP @ 6800 RPM) has 12 more horse power than 2003 BMW 545. (328 HP @ 6100 RPM). In normal driving conditions, 2009 Audi S4 should accelerate faster than 2003 BMW 545. With that said, vehicle weight also plays an important factor in acceleration. 2003 BMW 545 weights approximately 740 kg more than 2009 Audi S4.
Because 2009 Audi S4 is four wheel drive (4WD), it will have significant more traction and grip than 2003 BMW 545. In wet, icy, snow, or gravel driving conditions, 2009 Audi S4 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, 2003 BMW 545 (451 Nm @ 3600 RPM) has 41 more torque (in Nm) than 2009 Audi S4. (410 Nm @ 3500 RPM). This means 2003 BMW 545 will have an easier job in driving up hills or pulling heavy equipment than 2009 Audi S4.
Compare all specifications:
| 2009 Audi S4 | 2003 BMW 545 | |
| Make | Audi | BMW |
| Model | S4 | 545 |
| Year Released | 2009 | 2003 |
| Body Type | Convertible | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4161 cc | 4398 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 5 valves | 4 valves |
| Horse Power | 340 HP | 328 HP |
| Engine RPM | 6800 RPM | 6100 RPM |
| Torque | 410 Nm | 451 Nm |
| Torque RPM | 3500 RPM | 3600 RPM |
| Engine Bore Size | 84.5 mm | 92 mm |
| Engine Stroke Size | 92.8 mm | 82.7 mm |
| Drive Type | 4WD | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 930 kg | 1670 kg |
| Vehicle Length | 4580 mm | 4850 mm |
| Vehicle Width | 1780 mm | 1850 mm |
| Vehicle Height | 1400 mm | 1470 mm |
| Wheelbase Size | 2660 mm | 2890 mm |
| Fuel Consumption Highway | 11.2 L/100km | 7.7 L/100km |
| Fuel Consumption City | 16.8 L/100km | 15.8 L/100km |
| Fuel Consumption Overall | 14.7 L/100km | 10.6 L/100km |
| Fuel Tank Capacity | 63 L | 70 L |
