2003 Audi RS4 vs. 2005 Porsche 911
To start off, 2005 Porsche 911 is newer by 2 year(s). Which means there will be less support and parts availability for 2003 Audi RS4. In addition, the cost of maintenance, including insurance, on 2003 Audi RS4 would be higher. At 3,600 cc (6 cylinders), 2005 Porsche 911 is equipped with a bigger engine. In terms of performance, 2005 Porsche 911 (445 HP @ 5700 RPM) has 68 more horse power than 2003 Audi RS4. (377 HP @ 6300 RPM) In normal driving conditions, 2005 Porsche 911 should accelerate faster than 2003 Audi RS4. With that said, vehicle weight also plays an important factor in acceleration. 2005 Porsche 911 weights approximately 5 kg more than 2003 Audi RS4. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Both vehicles are four wheel drive (4WD) - it offers better handling, traction, and control in all driving conditions compared with front wheel drive or rear wheel drive vehicles. 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, 2005 Porsche 911 (620 Nm @ 3500 RPM) has 171 more torque (in Nm) than 2003 Audi RS4. (449 Nm @ 2500 RPM). This means 2005 Porsche 911 will have an easier job in driving up hills or pulling heavy equipment than 2003 Audi RS4.
Compare all specifications:
| 2003 Audi RS4 | 2005 Porsche 911 | |
| Make | Audi | Porsche |
| Model | RS4 | 911 |
| Year Released | 2003 | 2005 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Rear |
| Engine Size | 2671 cc | 3600 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | V | boxer |
| Valves per Cylinder | 5 valves | 4 valves |
| Horse Power | 377 HP | 445 HP |
| Engine RPM | 6300 RPM | 5700 RPM |
| Torque | 449 Nm | 620 Nm |
| Torque RPM | 2500 RPM | 3500 RPM |
| Fuel Type | Gasoline | Gasoline - Premium |
| Drive Type | 4WD | 4WD |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1585 kg | 1590 kg |
| Vehicle Length | 4480 mm | 4440 mm |
| Vehicle Width | 1740 mm | 1840 mm |
| Vehicle Height | 1450 mm | 1300 mm |
| Wheelbase Size | 2610 mm | 2360 mm |
| Fuel Tank Capacity | 55 L | 64 L |
