2003 BMW 325 vs. 2004 BMW 645
To start off, 2004 BMW 645 is newer by 1 year(s). Which means there will be less support and parts availability for 2003 BMW 325. In addition, the cost of maintenance, including insurance, on 2003 BMW 325 would be higher. At 4,398 cc (8 cylinders), 2004 BMW 645 is equipped with a bigger engine. In terms of performance, 2004 BMW 645 (328 HP @ 6100 RPM) has 136 more horse power than 2003 BMW 325. (192 HP @ 6000 RPM) In normal driving conditions, 2004 BMW 645 should accelerate faster than 2003 BMW 325. With that said, vehicle weight also plays an important factor in acceleration. 2004 BMW 645 weights approximately 335 kg more than 2003 BMW 325. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Let's talk about torque, 2004 BMW 645 (451 Nm @ 3600 RPM) has 206 more torque (in Nm) than 2003 BMW 325. (245 Nm @ 3500 RPM). This means 2004 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2003 BMW 325.
Compare all specifications:
| 2003 BMW 325 | 2004 BMW 645 | |
| Make | BMW | BMW |
| Model | 325 | 645 |
| Year Released | 2003 | 2004 |
| Body Type | Hatchback | Convertible |
| Engine Position | Front | Front |
| Engine Size | 2494 cc | 4398 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Horse Power | 192 HP | 328 HP |
| Engine RPM | 6000 RPM | 6100 RPM |
| Torque | 245 Nm | 451 Nm |
| Torque RPM | 3500 RPM | 3600 RPM |
| Engine Bore Size | 84.1 mm | 92 mm |
| Engine Stroke Size | 75 mm | 82.7 mm |
| Acceleration 0-100mph | 7.1 seconds | 6.1 seconds |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 3 doors | 2 doors |
| Vehicle Weight | 1480 kg | 1815 kg |
| Vehicle Length | 4270 mm | 4830 mm |
| Vehicle Width | 1760 mm | 1860 mm |
| Vehicle Height | 1410 mm | 1380 mm |
| Wheelbase Size | 2730 mm | 2790 mm |
| Fuel Consumption Overall | 8.9 L/100km | 12.8 L/100km |
| Fuel Tank Capacity | 63 L | 70 L |
