2003 Audi RS4 vs. 2005 Audi S8
To start off, 2005 Audi S8 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 4,172 cc (8 cylinders), 2005 Audi S8 is equipped with a bigger engine. In terms of performance, 2003 Audi RS4 (377 HP @ 6300 RPM) has 130 more horse power than 2005 Audi S8. (247 HP @ 4000 RPM). In normal driving conditions, 2003 Audi RS4 should accelerate faster than 2005 Audi S8. With that said, vehicle weight also plays an important factor in acceleration. 2005 Audi S8 weights approximately 185 kg more than 2003 Audi RS4.
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 Audi S8 (450 Nm @ 3400 RPM) has 1 more torque (in Nm) than 2003 Audi RS4. (449 Nm @ 2500 RPM). This means 2005 Audi S8 will have an easier job in driving up hills or pulling heavy equipment than 2003 Audi RS4. 2005 Audi S8 has automatic transmission and 2003 Audi RS4 has manual transmission. 2003 Audi RS4 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2005 Audi S8 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2003 Audi RS4 | 2005 Audi S8 | |
| Make | Audi | Audi |
| Model | RS4 | S8 |
| Year Released | 2003 | 2005 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2671 cc | 4172 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 5 valves | 5 valves |
| Horse Power | 377 HP | 247 HP |
| Engine RPM | 6300 RPM | 4000 RPM |
| Torque | 449 Nm | 450 Nm |
| Torque RPM | 2500 RPM | 3400 RPM |
| Drive Type | 4WD | AWD |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1585 kg | 1770 kg |
| Wheelbase Size | 2610 mm | 2290 mm |
| Fuel Tank Capacity | 55 L | 90 L |
