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 (339 HP @ 7000 RPM) has 91 more horse power than 1999 Audi A4. (248 HP @ 4150 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 450 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.
Because 1999 Audi A4 is four wheel drive (4WD), it will have significant more traction and grip than 2006 Audi S4. In wet, icy, snow, or gravel driving conditions, 1999 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, 2006 Audi S4 (410 Nm @ 3500 RPM) has 71 more torque (in Nm) than 1999 Audi A4. (339 Nm @ 1900 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 | Station Wagon |
| Engine Position | Front | Front |
| Engine Size | 1896 cc | 4163 cc |
| Engine Cylinders | 4 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Horse Power | 248 HP | 339 HP |
| Engine RPM | 4150 RPM | 7000 RPM |
| Torque | 339 Nm | 410 Nm |
| Torque RPM | 1900 RPM | 3500 RPM |
| Engine Bore Size | 79.5 mm | 84.6 mm |
| Engine Stroke Size | 95.5 mm | 92.8 mm |
| Engine Compression Ratio | 19.5:1 | 11.0:1 |
| Fuel Type | Diesel | Gasoline |
| Acceleration 0-100mph | 11.9 seconds | 5.8 seconds |
| Drive Type | 4WD | Front |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 5 doors | 5 doors |
| Vehicle Weight | 1430 kg | 1880 kg |
| Vehicle Length | 4480 mm | 4590 mm |
| Vehicle Width | 1740 mm | 1730 mm |
| Vehicle Height | 1420 mm | 1430 mm |
| Wheelbase Size | 2610 mm | 2650 mm |
| Fuel Tank Capacity | 60 L | 63 L |
