With the restyling of 1991, the Biturbo name was dropped for the open Spyder models. A series of aesthetical and technical upgrades were brought to the Spyder. The most significant modification regarded the introduction of 4 valve-per-cylinder heads with 4 overhead camshafts, which served to increase the performance despite the fitting of a catalytic converter. Wherever allowed by the legislation, customers could also specify the car without the catalytic converter. From a styling point of view, the car was reworked with new, slimmer headlights, taller bumpers and sills, 16” six-spoke alloys, more aerodynamic rear-view mirrors and a peculiar spoiler at the base of the windscreen invented by Marcello Gandini.
| Data sheet | Spyder III | Spyder III cat. | Spyder III (2800) cat. |
|---|---|---|---|
| Model code | Tipo AM333 | Tipo AM333 | Tipo AM333 |
| Body type | 2+2 spyder | 2+2 spyder | 2+2 spyder |
| Design | Zagato - Gandini | Zagato - Gandini | Zagato - Gandini |
| Production years | 1991 - 1994 | 1991 - 1994 | 1991 - 1994 |
| Maserati era | De Tomaso | De Tomaso | De Tomaso |
| Numbers produced | 509 (Spyder III & Spyder III cat.) | 510 (Spyder III & Spyder III cat.) | 200 |
| Chassis | Monocoque steel construction | Monocoque steel construction | Monocoque steel construction |
| Dry weight | 1,333kg | 1,370kg | 1,369kg |
| Engine configuration | 90° V6, 24 valves, double overhead camshaft, twin-turbo | 90° V6, 24 valves, double overhead camshaft, twin-turbo | 90° V6, three valves per cylinder (two intake, one exhaust), single overhead camshaft, twin-turbo |
| Displacement | 1,996cc | 1,996cc | 2,790cc |
| Maximum power | 245hp @ 6,000rpm | 240hp @ 6,200rpm | 225hp @ 5,500rpm |
| Top speed | 230km/h | 225km/h | 220km/h |
