From 1989 a revised Biturbo Spyder model was introduced. These cars could be recognised by its 15-inch alloy rims (compared to 14" rims for the original model) and redesigned, rounder front and rear bumpers. The export model received the larger 2.8-litre engine, replacing the previous 2.5-litre unit. Bodies for the Spyder were still produced by Zagato near Milan. These cars are often referred to as the Spyder '90 as the Biturbo name was dropped for the model.
| Data sheet | 3500GT | 3500GTI |
|---|---|---|
| Body type | 2-door, 2+2 coupé or 2-seater spyder | |
| Design Touring (Coupè), Vignale (Spyder) | Touring (Coupè), Vignale (Spyder) | |
| Production years | 1957 - 1964 | 1961 - 1964 |
| Maserati era | Orsi family | |
| Numbers produced | 2.226 | |
| Chassis | Tubular ladder-frame platform | |
| Dry / kerb weight | 1.300 / 1.440kg | |
| Engine configuration | Straight six, double overhead camshaft | |
| Maximum power | 220hp @ 5.500rpm | 235hp @ 5.800rpm |
| Top speed | 215km/h |
