1999 Audi A4 vs. 2006 Audi S4
To start off, 2006 Audi S4 is newer by 7 year(s). Which means there will be less support and parts availability for 1999 Audi A4. In addition, the cost of maintenance, including insurance, on 1999 Audi A4 would be higher. At 4,163 cc (8 cylinders), 2006 Audi S4 is equipped with a bigger engine. In terms of performance, 2006 Audi S4 (340 HP @ 7000 RPM) has 177 more horse power than 1999 Audi A4. (163 HP @ 6000 RPM) In normal driving conditions, 2006 Audi S4 should accelerate faster than 1999 Audi A4. With that said, vehicle weight also plays an important factor in acceleration. 2006 Audi S4 weights approximately 210 kg more than 1999 Audi A4. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Both vehicles are front wheel drive (FWD). Which offers better traction when its slippery than 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, 2006 Audi S4 (410 Nm @ 3500 RPM) has 176 more torque (in Nm) than 1999 Audi A4. (234 Nm @ 3200 RPM). This means 2006 Audi S4 will have an easier job in driving up hills or pulling heavy equipment than 1999 Audi A4.
Compare all specifications:
| 1999 Audi A4 | 2006 Audi S4 | |
| Make | Audi | Audi |
| Model | A4 | S4 |
| Year Released | 1999 | 2006 |
| Body Type | Station Wagon | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2393 cc | 4163 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 5 valves | 5 valves |
| Horse Power | 163 HP | 340 HP |
| Engine RPM | 6000 RPM | 7000 RPM |
| Torque | 234 Nm | 410 Nm |
| Torque RPM | 3200 RPM | 3500 RPM |
| Engine Bore Size | 81 mm | 84.6 mm |
| Engine Stroke Size | 77.4 mm | 93 mm |
| Drive Type | Front | Front |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 5 doors | 4 doors |
| Vehicle Weight | 1320 kg | 1530 kg |
| Vehicle Length | 4480 mm | 4590 mm |
| Vehicle Width | 1740 mm | 1790 mm |
| Vehicle Height | 1450 mm | 1420 mm |
| Wheelbase Size | 2610 mm | 2660 mm |
| Fuel Tank Capacity | 70 L | 63 L |
