2006 Alfa Romeo 156 vs. 2004 BMW 645
To start off, 2006 Alfa Romeo 156 is newer by 2 year(s). Which means there will be less support and parts availability for 2004 BMW 645. In addition, the cost of maintenance, including insurance, on 2004 BMW 645 would be higher. At 4,392 cc (8 cylinders), 2004 BMW 645 is equipped with a bigger engine. In terms of performance, 2004 BMW 645 (322 HP @ 7400 RPM) has 132 more horse power than 2006 Alfa Romeo 156. (190 HP @ 6300 RPM) In normal driving conditions, 2004 BMW 645 should accelerate faster than 2006 Alfa Romeo 156. With that said, vehicle weight also plays an important factor in acceleration. 2004 BMW 645 weights approximately 100 kg more than 2006 Alfa Romeo 156. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2004 BMW 645 is rear wheel drive (RWD), it offers better handling in dry conditions; in addition, if you are looking to drift, it will be much easier to do with 2004 BMW 645. However, in wet, icy, snow, or gravel driving conditions, 2006 Alfa Romeo 156, being front wheel drive (FWD), will offer much better control with better grip. 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, 2004 BMW 645 (447 Nm) has 229 more torque (in Nm) than 2006 Alfa Romeo 156. (218 Nm). This means 2004 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2006 Alfa Romeo 156.
Compare all specifications:
| 2006 Alfa Romeo 156 | 2004 BMW 645 | |
| Make | Alfa Romeo | BMW |
| Model | 156 | 645 |
| Year Released | 2006 | 2004 |
| Body Type | Station Wagon | Coupe |
| Engine Position | Front | Front |
| Engine Size | 2492 cc | 4392 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 190 HP | 322 HP |
| Engine RPM | 6300 RPM | 7400 RPM |
| Torque | 218 Nm | 447 Nm |
| Engine Bore Size | 88 mm | 92 mm |
| Engine Stroke Size | 68.3 mm | 83 mm |
| Engine Compression Ratio | 10.3:1 | 10.5:1 |
| Drive Type | Front | Rear |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1615 kg | 1715 kg |
| Vehicle Length | 4450 mm | 4840 mm |
| Vehicle Width | 1750 mm | 1860 mm |
| Vehicle Height | 1440 mm | 1380 mm |
| Wheelbase Size | 2600 mm | 2790 mm |
| Fuel Consumption Overall | 11.8 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 63 L | 70 L |
