2007 GMC Sierra vs. 2003 Pontiac Grand Prix
To start off, 2007 GMC Sierra is newer by 4 year(s). Which means there will be less support and parts availability for 2003 Pontiac Grand Prix. In addition, the cost of maintenance, including insurance, on 2003 Pontiac Grand Prix would be higher. At 5,999 cc (8 cylinders), 2007 GMC Sierra is equipped with a bigger engine. In terms of performance, 2007 GMC Sierra (300 HP @ 4400 RPM) has 126 more horse power than 2003 Pontiac Grand Prix. (174 HP @ 5200 RPM). In normal driving conditions, 2007 GMC Sierra should accelerate faster than 2003 Pontiac Grand Prix.
Let's talk about torque, 2007 GMC Sierra (488 Nm @ 4000 RPM) has 224 more torque (in Nm) than 2003 Pontiac Grand Prix. (264 Nm @ 4000 RPM). This means 2007 GMC Sierra will have an easier job in driving up hills or pulling heavy equipment than 2003 Pontiac Grand Prix.
Compare all specifications:
| 2007 GMC Sierra | 2003 Pontiac Grand Prix | |
| Make | GMC | Pontiac |
| Model | Sierra | Grand Prix |
| Year Released | 2007 | 2003 |
| Body Type | Pickup | Sedan |
| Engine Position | Front | Front |
| Engine Size | 5999 cc | 3130 cc |
| Engine Cylinders | 8 cylinders | 6 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 2 valves | 2 valves |
| Horse Power | 300 HP | 174 HP |
| Engine RPM | 4400 RPM | 5200 RPM |
| Torque | 488 Nm | 264 Nm |
| Torque RPM | 4000 RPM | 4000 RPM |
| Engine Bore Size | 102 mm | 89 mm |
| Engine Stroke Size | 92 mm | 84 mm |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 6 seats | 5 seats |
| Number of Doors | 3 doors | 4 doors |
| Vehicle Length | 6330 mm | 5000 mm |
| Vehicle Width | 2450 mm | 1850 mm |
| Vehicle Height | 1940 mm | 1400 mm |
| Wheelbase Size | 4010 mm | 3160 mm |
| Fuel Tank Capacity | 129 L | 66 L |
