The 422 was introduced in 1988 as a replacement for all previous versions of the 420 four-door family, including the 420 Si from which its mechanicals were derived. The car was restyled with a new front grille, mirrors and five-bolt alloy wheels. In 1990, the 4.24v mirrored the two-door 2.24v, using the latest four-valve-per-cylinder, four overhead-camshaft V6 engine. Styling enhancements (including blacked-out chrome trim, specific bumpers and rocker panels along with a discreet spoiler on the trunk) conferred a sporty yet refined allure to this high-performance sedan. The independent suspension featured active electronic control on all four wheels, while the interior’s mix of leather and wood trim conveyed a feeling of exclusivity. Launched in December 1990, the 4.18v was similar to the 422, designed with smaller displacement for the Italian market. Its main feature was ABS fitted as standard, a first for the Biturbo family. Produced in only 77 units, this particular model is unquestionably one of the rarest models within the Biturbo range.
| Data sheet | 422 | 4.18v | 4.24v |
|---|---|---|---|
| Model code | Tipo AM332 | Tipo AM332 | Tipo AM332 |
| Body type | 4-door, 5-seater saloon | 4-door, 5-seater saloon | 4-door, 5-seater saloon |
| Design | Pierangelo Andreani | Pierangelo Andreani | Pierangelo Andreani |
| Production years | 1988 - 1992 | 1990 - 1993 | 1990 - 1993 |
| Maserati era | De Tomaso | De Tomaso | De Tomaso |
| Numbers produced | 978 | 77 | 384 |
| Chassis | Monocoque steel construction | Monocoque steel construction | Monocoque steel construction |
| Dry weight | 1,257kg | 1,275kg | 1,370kg |
| Engine configuration | 90° V6, three valves per cylinder (two intake, one exhaust), single overhead camshaft, twin-turbo | 90° V6, three valves per cylinder (two intake, one exhaust), single overhead camshaft, twin-turbo | 90° V6, 24 valves, double overhead camshaft, twin-turbo |
| Displacement | 1,996cc | 1,996cc | 1,996cc |
| Maximum power | 220hp @ 6,250rpm | 220hp @ 6,350rpm | 245hp @ 6,200rpm |
| Top speed | 225km/h | 218km/h | 230km/h |
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