Germany vs West Germany — 1975 vs 1981
| Kadett GT/E Coupe | Manta 400 Rally Homologation | |
|---|---|---|
| Horsepower | 105 hp | 144 hp |
| Torque | 117 lb-ft | 155 lb-ft |
| Engine Size | 1,897 cc | 2,420 cc |
| 0-60 mph | 10.0 sec | 8.5 sec |
| Top Speed | 115 mph | 129 mph |
| ¼ Mile | 17.5 sec | 16.0 sec |
| Weight | 2,116 lbs | 2,337 lbs |
| Wheelbase | 2,518 mm | 2,518 mm |
| Length | 4,210 mm | 4,470 mm |
| Units Produced | 18,500 | 245 |
| Value (Excellent) | $35,000 | $200,000 |
| Collectibility | 6/10 | 8/10 |
| Rarity | 7/10 | 9/10 |
The 1981 Opel Manta 400 Rally Homologation emerges ahead in most objective measures, offering more power, quicker acceleration, higher top speed. The 1975 Opel Kadett GT/E Coupe counters with lighter weight, better value, but the numbers favor its rival. Still, both are remarkable machines, and the final choice often comes down to which driving experience speaks to you.
The 1975 Opel Kadett GT/E Coupe and 1981 Opel Manta 400 Rally Homologation share a manufacturer in Opel, but that's where the similarities get interesting. These two models reveal the versatility and ambition of the Opel brand. The 1981 Opel Manta 400 Rally Homologation holds a clear advantage in raw power with 144 hp compared to 105 hp, a 39-horsepower difference that shapes the driving experience. Under the hood, the contrast is notable: the Opel Kadett uses a Inline-4 OHC displacing 1,897 cc, while the Opel Manta 400 relies on a Inline-4 DOHC 16V with 2,420 cc. In the sprint to 60 mph, the 1981 Opel Manta 400 Rally Homologation edges ahead at 8.5 seconds versus 10.0 seconds. The Opel Kadett carries a weight advantage, tipping the scales 221 lbs lighter. Rarity plays a significant role here — with only 245 units built, the 1981 Opel Manta 400 Rally Homologation is considerably scarcer than the Opel Kadett's 18,500 examples. On the collector market, the 1981 Opel Manta 400 Rally Homologation commands a significant premium over the 1975 Opel Kadett GT/E Coupe, reflecting differences in prestige and rarity. From a collectibility standpoint, the 1981 Opel Manta 400 Rally Homologation rates higher among enthusiasts and auction houses.