2004 Alfa Romeo 156 vs. 1972 McLaren M21
To start off, 2004 Alfa Romeo 156 is newer by 32 year(s). Which means there will be less support and parts availability for 1972 McLaren M21. In addition, the cost of maintenance, including insurance, on 1972 McLaren M21 would be higher. At 2,492 cc (5 cylinders), 2004 Alfa Romeo 156 is equipped with a bigger engine. In terms of performance, 1972 McLaren M21 (283 HP @ 9000 RPM) has 110 more horse power than 2004 Alfa Romeo 156. (173 HP @ 4000 RPM) In normal driving conditions, 1972 McLaren M21 should accelerate faster than 2004 Alfa Romeo 156. With that said, vehicle weight also plays an important factor in acceleration. 2004 Alfa Romeo 156 weights approximately 995 kg more than 1972 McLaren M21.
Compare all specifications:
| 2004 Alfa Romeo 156 | 1972 McLaren M21 | |
| Make | Alfa Romeo | McLaren |
| Model | 156 | M21 |
| Year Released | 2004 | 1972 |
| Engine Size | 2492 cc | 1927 cc |
| Engine Cylinders | 5 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Horse Power | 173 HP | 283 HP |
| Engine RPM | 4000 RPM | 9000 RPM |
| Fuel Type | Diesel | Gasoline |
| Vehicle Weight | 1460 kg | 465 kg |
